diff --git a/.travis.yml b/.travis.yml
index 8f04a29d..4aa60c6a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,7 @@ before_install:
   - ./deploy_before_install.sh
 # install: not required :)
 script:
+  - gulp webp:make
   - echo 'Building Site'
   - gulp build --production
   - gulp image_min
diff --git a/assets/stylus/components/feature.styl b/assets/stylus/components/feature.styl
index 9b82a8aa..d617260f 100644
--- a/assets/stylus/components/feature.styl
+++ b/assets/stylus/components/feature.styl
@@ -209,12 +209,12 @@
   background-size cover
   backface-visibility: hidden
 
-
 .img-placeholder
   // nothing here yet
-    
+
 .img-large
 .img-small
+.img-large--webp
   opacity 0
 
 .img-loaded
@@ -227,6 +227,40 @@
   filter blur(50px)
   transform scale(1)
 
+.img-small--webp
+  opacity 1
+  filter blur(20px)
+  transform scale(1)
+
+.img-small--webp
+  &.lazyloaded
+    opacity 0
+    transition opacity .1s linear
+
+.img-large--webp
+  &.lazyloaded
+    opacity 1
+    transition opacity .1s linear
+
+.lazy-img
+  margin auto
+  overflow hidden
+
+.ratio-box
+  position relative
+  height 0
+  display block
+  
+.ratio-box img
+.ratio-box iframe
+.ratio-box video
+  position absolute
+  top 0
+  left 0
+  width 100%
+  height 100%
+  display block
+
 .Background-img--full-wh-grid
   background-position center center
   background-repeat no-repeat
diff --git a/config.json b/config.json
index 62cae00d..912db1c5 100644
--- a/config.json
+++ b/config.json
@@ -16,7 +16,10 @@
   "require": {
     "moment": "moment",
     "_": "underscore",
-    "typogr": "typogr"
+    "typogr": "typogr",
+    "imageSize": "image-size",
+    "fs": "fs",
+    "path": "path"
   },
   "jade": {
     "pretty": true
diff --git a/config_production.json b/config_production.json
index c246538d..1fec6eaa 100644
--- a/config_production.json
+++ b/config_production.json
@@ -15,7 +15,10 @@
   "require": {
     "moment": "moment",
     "_": "underscore",
-    "typogr": "typogr"
+    "typogr": "typogr",
+    "imageSize": "image-size",
+    "fs": "fs",
+    "path": "path"
   },
   "jade": {
     "pretty": true
diff --git a/config_staging.json b/config_staging.json
index 009e4125..dfe9070e 100644
--- a/config_staging.json
+++ b/config_staging.json
@@ -15,7 +15,10 @@
   "require": {
     "moment": "moment",
     "_": "underscore",
-    "typogr": "typogr"
+    "typogr": "typogr",
+    "imageSize": "image-size",
+    "fs": "fs",
+    "path": "path"
   },
   "jade": {
     "pretty": true
diff --git a/contents/js/vendor/lazysizes.min.js b/contents/js/vendor/lazysizes.min.js
new file mode 100644
index 00000000..e6010259
--- /dev/null
+++ b/contents/js/vendor/lazysizes.min.js
@@ -0,0 +1,2 @@
+/*! lazysizes - v4.0.0-rc1 */
+!function(a,b){var c=b(a,a.document);a.lazySizes=c,"object"==typeof module&&module.exports&&(module.exports=c)}(window,function(a,b){"use strict";if(b.getElementsByClassName){var c,d,e=b.documentElement,f=a.Date,g=a.HTMLPictureElement,h="addEventListener",i="getAttribute",j=a[h],k=a.setTimeout,l=a.requestAnimationFrame||k,m=a.requestIdleCallback,n=/^picture$/i,o=["load","error","lazyincluded","_lazyloaded"],p={},q=Array.prototype.forEach,r=function(a,b){return p[b]||(p[b]=new RegExp("(\\s|^)"+b+"(\\s|$)")),p[b].test(a[i]("class")||"")&&p[b]},s=function(a,b){r(a,b)||a.setAttribute("class",(a[i]("class")||"").trim()+" "+b)},t=function(a,b){var c;(c=r(a,b))&&a.setAttribute("class",(a[i]("class")||"").replace(c," "))},u=function(a,b,c){var d=c?h:"removeEventListener";c&&u(a,b),o.forEach(function(c){a[d](c,b)})},v=function(a,d,e,f,g){var h=b.createEvent("CustomEvent");return e||(e={}),e.instance=c,h.initCustomEvent(d,!f,!g,e),a.dispatchEvent(h),h},w=function(b,c){var e;!g&&(e=a.picturefill||d.pf)?e({reevaluate:!0,elements:[b]}):c&&c.src&&(b.src=c.src)},x=function(a,b){return(getComputedStyle(a,null)||{})[b]},y=function(a,b,c){for(c=c||a.offsetWidth;c<d.minSize&&b&&!a._lazysizesWidth;)c=b.offsetWidth,b=b.parentNode;return c},z=function(){var a,c,d=[],e=[],f=d,g=function(){var b=f;for(f=d.length?e:d,a=!0,c=!1;b.length;)b.shift()();a=!1},h=function(d,e){a&&!e?d.apply(this,arguments):(f.push(d),c||(c=!0,(b.hidden?k:l)(g)))};return h._lsFlush=g,h}(),A=function(a,b){return b?function(){z(a)}:function(){var b=this,c=arguments;z(function(){a.apply(b,c)})}},B=function(a){var b,c=0,d=125,e=666,g=e,h=function(){b=!1,c=f.now(),a()},i=m?function(){m(h,{timeout:g}),g!==e&&(g=e)}:A(function(){k(h)},!0);return function(a){var e;(a=a===!0)&&(g=44),b||(b=!0,e=d-(f.now()-c),0>e&&(e=0),a||9>e&&m?i():k(i,e))}},C=function(a){var b,c,d=99,e=function(){b=null,a()},g=function(){var a=f.now()-c;d>a?k(g,d-a):(m||e)(e)};return function(){c=f.now(),b||(b=k(g,d))}},D=function(){var c,g,l,m,o,p,y,D,F,G,H,I,J,K,L,M=/^img$/i,N=/^iframe$/i,O="onscroll"in a&&!/glebot/.test(navigator.userAgent),P=0,Q=0,R=0,S=-1,T=function(a){R--,a&&a.target&&u(a.target,T),(!a||0>R||!a.target)&&(R=0)},U=function(a,c){var d,f=a,g="hidden"==x(b.body,"visibility")||"hidden"!=x(a,"visibility");for(F-=c,I+=c,G-=c,H+=c;g&&(f=f.offsetParent)&&f!=b.body&&f!=e;)g=(x(f,"opacity")||1)>0,g&&"visible"!=x(f,"overflow")&&(d=f.getBoundingClientRect(),g=H>d.left&&G<d.right&&I>d.top-1&&F<d.bottom+1);return g},V=function(){var a,f,h,j,k,m,n,p,q;if((o=d.loadMode)&&8>R&&(a=c.length)){f=0,S++,null==K&&("expand"in d||(d.expand=e.clientHeight>500&&e.clientWidth>500?500:370),J=d.expand,K=J*d.expFactor),K>Q&&1>R&&S>2&&o>2&&!b.hidden?(Q=K,S=0):Q=o>1&&S>1&&6>R?J:P;for(;a>f;f++)if(c[f]&&!c[f]._lazyRace)if(O)if((p=c[f][i]("data-expand"))&&(m=1*p)||(m=Q),q!==m&&(y=innerWidth+m*L,D=innerHeight+m,n=-1*m,q=m),h=c[f].getBoundingClientRect(),(I=h.bottom)>=n&&(F=h.top)<=D&&(H=h.right)>=n*L&&(G=h.left)<=y&&(I||H||G||F)&&(d.loadHidden||"hidden"!=x(c[f],"visibility"))&&(l&&3>R&&!p&&(3>o||4>S)||U(c[f],m))){if(ba(c[f]),k=!0,R>9)break}else!k&&l&&!j&&4>R&&4>S&&o>2&&(g[0]||d.preloadAfterLoad)&&(g[0]||!p&&(I||H||G||F||"auto"!=c[f][i](d.sizesAttr)))&&(j=g[0]||c[f]);else ba(c[f]);j&&!k&&ba(j)}},W=B(V),X=function(a){s(a.target,d.loadedClass),t(a.target,d.loadingClass),u(a.target,Z)},Y=A(X),Z=function(a){Y({target:a.target})},$=function(a,b){try{a.contentWindow.location.replace(b)}catch(c){a.src=b}},_=function(a){var b,c=a[i](d.srcsetAttr);(b=d.customMedia[a[i]("data-media")||a[i]("media")])&&a.setAttribute("media",b),c&&a.setAttribute("srcset",c)},aa=A(function(a,b,c,e,f){var g,h,j,l,o,p;(o=v(a,"lazybeforeunveil",b)).defaultPrevented||(e&&(c?s(a,d.autosizesClass):a.setAttribute("sizes",e)),h=a[i](d.srcsetAttr),g=a[i](d.srcAttr),f&&(j=a.parentNode,l=j&&n.test(j.nodeName||"")),p=b.firesLoad||"src"in a&&(h||g||l),o={target:a},p&&(u(a,T,!0),clearTimeout(m),m=k(T,2500),s(a,d.loadingClass),u(a,Z,!0)),l&&q.call(j.getElementsByTagName("source"),_),h?a.setAttribute("srcset",h):g&&!l&&(N.test(a.nodeName)?$(a,g):a.src=g),f&&(h||l)&&w(a,{src:g})),a._lazyRace&&delete a._lazyRace,t(a,d.lazyClass),z(function(){(!p||a.complete&&a.naturalWidth>1)&&(p?T(o):R--,X(o))},!0)}),ba=function(a){var b,c=M.test(a.nodeName),e=c&&(a[i](d.sizesAttr)||a[i]("sizes")),f="auto"==e;(!f&&l||!c||!a.src&&!a.srcset||a.complete||r(a,d.errorClass))&&(b=v(a,"lazyunveilread").detail,f&&E.updateElem(a,!0,a.offsetWidth),a._lazyRace=!0,R++,aa(a,b,f,e,c))},ca=function(){if(!l){if(f.now()-p<999)return void k(ca,999);var a=C(function(){d.loadMode=3,W()});l=!0,d.loadMode=3,W(),j("scroll",function(){3==d.loadMode&&(d.loadMode=2),a()},!0)}};return{_:function(){p=f.now(),c=b.getElementsByClassName(d.lazyClass),g=b.getElementsByClassName(d.lazyClass+" "+d.preloadClass),L=d.hFac,j("scroll",W,!0),j("resize",W,!0),a.MutationObserver?new MutationObserver(W).observe(e,{childList:!0,subtree:!0,attributes:!0}):(e[h]("DOMNodeInserted",W,!0),e[h]("DOMAttrModified",W,!0),setInterval(W,999)),j("hashchange",W,!0),["focus","mouseover","click","load","transitionend","animationend","webkitAnimationEnd"].forEach(function(a){b[h](a,W,!0)}),/d$|^c/.test(b.readyState)?ca():(j("load",ca),b[h]("DOMContentLoaded",W),k(ca,2e4)),c.length?(V(),z._lsFlush()):W()},checkElems:W,unveil:ba}}(),E=function(){var a,c=A(function(a,b,c,d){var e,f,g;if(a._lazysizesWidth=d,d+="px",a.setAttribute("sizes",d),n.test(b.nodeName||""))for(e=b.getElementsByTagName("source"),f=0,g=e.length;g>f;f++)e[f].setAttribute("sizes",d);c.detail.dataAttr||w(a,c.detail)}),e=function(a,b,d){var e,f=a.parentNode;f&&(d=y(a,f,d),e=v(a,"lazybeforesizes",{width:d,dataAttr:!!b}),e.defaultPrevented||(d=e.detail.width,d&&d!==a._lazysizesWidth&&c(a,f,e,d)))},f=function(){var b,c=a.length;if(c)for(b=0;c>b;b++)e(a[b])},g=C(f);return{_:function(){a=b.getElementsByClassName(d.autosizesClass),j("resize",g)},checkElems:g,updateElem:e}}(),F=function(){F.i||(F.i=!0,E._(),D._())};return function(){var b,c={lazyClass:"lazyload",loadedClass:"lazyloaded",loadingClass:"lazyloading",preloadClass:"lazypreload",errorClass:"lazyerror",autosizesClass:"lazyautosizes",srcAttr:"data-src",srcsetAttr:"data-srcset",sizesAttr:"data-sizes",minSize:40,customMedia:{},init:!0,expFactor:1.5,hFac:.8,loadMode:2,loadHidden:!0};d=a.lazySizesConfig||a.lazysizesConfig||{};for(b in c)b in d||(d[b]=c[b]);a.lazySizesConfig=d,k(function(){d.init&&F()})}(),c={cfg:d,autoSizer:E,loader:D,init:F,uP:w,aC:s,rC:t,hC:r,fire:v,gW:y,rAF:z}}});
\ No newline at end of file
diff --git a/contents/media b/contents/media
index 0c007c28..5af21a47 160000
--- a/contents/media
+++ b/contents/media
@@ -1 +1 @@
-Subproject commit 0c007c281646841f721ebb5052941f630e8b57fa
+Subproject commit 5af21a47b2a02b705ef0e3ee667362603118103f
diff --git a/gulpfile.coffee b/gulpfile.coffee
index 522bc4b3..4700a279 100644
--- a/gulpfile.coffee
+++ b/gulpfile.coffee
@@ -27,6 +27,10 @@ uncss = require "gulp-uncss"
 clean = require "gulp-clean"
 rev = require 'gulp-rev'
 rev_replace = require 'gulp-rev-replace'
+webp = require 'gulp-webp'
+size = require 'gulp-size'
+rename = require 'gulp-rename'
+imgResize = require 'gulp-image-resize'
 
 # =================================================================                      
 # high level tasks
@@ -43,7 +47,7 @@ gulp.task "build", (cb)->
 
 gulp.task "preview", (cb)->
   return runSequence  ['build:clean', 'js:clean'],
-                      ['css:build','js:build'],
+                      ['css:build','js:build', 'webp:make'],
                       'build_wintersmith',
                       'css:clean',
                       cb
@@ -191,6 +195,55 @@ gulp.task 'image_min', ->
     .pipe(image_min(options))
     .pipe(gulp.dest('./'))
 
+# =================================================================                      
+# lazyload & webp tasks
+# ================================================================= 
+
+gulp.task "img:make", (cb)->
+  return runSequence  'webp:make',
+                      'img:make:previews'
+                      cb
+
+gulp.task "img:clean", (cb)->
+  return runSequence  'jpeg:format',
+                      'jpeg:clean'
+                      cb
+
+gulp.task "jpeg:clean", ->
+  return gulp.src('contents/media/images/**/*.{jpeg}',{read:false})
+          .pipe(clean())
+
+gulp.task "jpeg:format", ->
+  return gulp.src('contents/media/images/**/*.{jpeg}',{base: './'})
+    .pipe plumber()
+    .pipe imgResize({format: 'jpg'})
+    .pipe(gulp.dest('./'))
+
+gulp.task 'img:make:previews', ->
+  options = {
+    resize: [20,20],
+    quality: 85,
+    progressive: true,
+    compressionLevel: 6,
+    sequentialRead: true,
+    trellisQuantisation: false
+  }
+
+  return gulp.src('./build/media/images/**/*.{jpg,png}',{base: './'})
+    .pipe(plumber())
+    .pipe(image_min(options))
+    .pipe rename
+      suffix: '_preview'
+    .pipe(gulp.dest('./'))
+
+gulp.task 'webp:make', ->
+  return gulp.src('./contents/media/images/**/*.{jpg,png}',{base: './'})
+    .pipe plumber()
+    .pipe size()
+    .pipe webp
+      quality: 80
+    .pipe size()
+    .pipe gulp.dest('./')
 
 # =================================================================                      
 # site compile tasks
@@ -330,6 +383,9 @@ gulp.task "css:clean", ->
                 new RegExp('^.parsley-.*')
                 new RegExp('^.datalist.*')
                 new RegExp('^li.active.*')
+                new RegExp('^.lazyloaded.*')
+                new RegExp('^.img-large--webp.*')
+                new RegExp('^.img-small--webp.*')
                 ]
                 ))
     .pipe(gulp.dest('build/css'))
diff --git a/package.json b/package.json
index f4076fa0..711dd228 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,9 @@
     "gulp-coffee": "^2.3.3",
     "gulp-concat": "^2.6.1",
     "gulp-favicons": "^2.2.7",
+    "gulp-image-resize": "^0.12.0",
     "gulp-plumber": "^1.1.0",
+    "gulp-rename": "^1.2.2",
     "gulp-rev": "^7.1.2",
     "gulp-rev-replace": "^0.4.3",
     "gulp-sharp-minimal": "git+https://github.com/pupil-labs/gulp-sharp-minimal.git",
@@ -36,6 +38,8 @@
     "gulp-uglify": "^2.0.0",
     "gulp-uncss": "^1.0.6",
     "gulp-util": "^3.0.7",
+    "gulp-webp": "^2.3.0",
+    "image-size": "^0.5.4",
     "minimist": "^1.2.0",
     "run-sequence": "^1.2.2",
     "run-wintersmith": "^0.0.3"
diff --git a/templates/blog.jade b/templates/blog.jade
index ade549f7..f6541ac1 100644
--- a/templates/blog.jade
+++ b/templates/blog.jade
@@ -37,10 +37,14 @@ block main
    
     div.Site-content-container
 
+      include includes/webp-img
+
       div.Grid.Grid--1of2.Grid--gutters-lg
         each article, i in articles.slice(1)
 
-          - var img_src = (article.metadata.featured_img_thumb ? article.metadata.featured_img_thumb : "https://placehold.it/800x600")
+          - var img_thumb = article.metadata.featured_img_thumb
+          - var img_src = (img_thumb ? img_thumb : "https://placehold.it/800x600")
+
 
             div.Grid-cell
 
@@ -53,9 +57,9 @@ block main
                         div.Caption-tag= article.metadata.tag.caption
 
               else
+
                 a(href=article.url)
-                  div.Feature-image--blog-archive--wrapper.Grid--center.Grid--justifyCenter.Grid-cell--fillHeight
-                    div(src=img_src style="background-image: url('"+img_src+"');").Background-img--blog-archive.Background-img-contain
+                  +webp-img(img_thumb, article.title, article.title, "height:30vh;", "object-fit:contain;height:30vh;padding-bottom:3em;")
 
               a(href=article.url)
                 h2.Blog-article-title= article.title
diff --git a/templates/home.jade b/templates/home.jade
index 1ecf688f..18fb9660 100644
--- a/templates/home.jade
+++ b/templates/home.jade
@@ -23,6 +23,7 @@ block main
         h1.Background-img-caption Open source eye tracking.
         //- h2.Background-img--caption-h2 
 
+    include includes/webp-img
     //- pupil intro row
     div(id="content-top" class="Site-content-container")
       div.Feature-container-column
@@ -39,8 +40,7 @@ block main
                 p All hardware is designed, developed, and assembled in our Berlin office and ships worldwide. Check out products on our #[a(href="/store" title="Pupil Labs store") store]. 
               div.Grid-cell
                 figure.Feature-figure.u-padBottom--1
-                  img(class="Feature-image" src="media/images/home/platform/eye_debug_01_opaque.png" title="Binocular 3D gaze mapper" alt="Binocular 3D gaze mapper")
-
+                  +webp-img("/media/images/home/platform/eye_debug_01_opaque.png", "Binocular 3D gaze mapper", "Binocular 3D gaze mapper")
 
     //- oss motivation row
     div.Site-gray-bkg
diff --git a/templates/includes/js.jade b/templates/includes/js.jade
index 60c9390e..bef6a841 100644
--- a/templates/includes/js.jade
+++ b/templates/includes/js.jade
@@ -1,3 +1,6 @@
+//- js lazysizes
+script(src=contents.js.vendor['lazysizes.min.js'].url)
+
 //- google jquery and jquery fallback
 script(src="//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js")
 script.
diff --git a/templates/includes/webp-img.jade b/templates/includes/webp-img.jade
new file mode 100644
index 00000000..e9c9a301
--- /dev/null
+++ b/templates/includes/webp-img.jade
@@ -0,0 +1,69 @@
+mixin webp-img(src, title, alt, picture_style, img_style)
+  
+  //- remove img src path suffix 
+  - var path_nosuffix = src.replace(/[.][a-z]+/,"");
+  //- get absolute path from the src path and remove suffix
+  - var absolute_path = (path.resolve("./contents"+src.match(/\/media.+/, "")));
+  - var absolute_nosuffix = absolute_path.replace(/[.][a-z]+/,"");
+
+  //- sources is an array of [str : image_type/suffix, bool : file exists]
+  //- The order of this array is important as it specifies the order we want sources within the picture element.
+  - var sources = [["webp", false],["jpg", false],["png", false]];
+
+  //- Update sources array. 
+  //- For each source, check if the file type exists. bool true if exists
+  - for (i in sources) {
+  -   var suffix = sources[i][0];
+  -   sources[i][1] = fs.existsSync(absolute_nosuffix+"."+suffix);
+  -   };
+
+  //- Add all sources with valid file path (all sources that exist).
+  - var filtered_sources = sources.filter(function(e,i,a){
+  -  return e[1] === true;
+  - });
+
+  //- filtered_sources = [] if no valid source
+  - var no_sources, preferred_src_suffix;
+  //- overwrite filtered_sources with new array with jpg only
+  - if (filtered_sources.length > 0) {
+  -    no_sources = filtered_sources.every(function(e,i,a){
+  -       return !e[1];
+  -    });
+  -    preferred_src_suffix = filtered_sources[0][0];
+  - } else {
+  -    console.log("no valid source ! "+src);  
+  -    no_sources = true;
+  -    preferred_src_suffix = 'jpg'; 
+  - }
+
+  //- This is a workaround and not a long term solution.
+  //- This assumes that if there is no function argument specified for picture_style, 
+  //- then we assume that it is not a blog post then calculate img ratio from image dimensions instead
+  - if (!picture_style && !no_sources){
+  -   var img_size = imageSize("./contents" + src );
+  -   var width = img_size.width;
+  -   var height = img_size.height;
+  -  } 
+
+  - picture_style = !picture_style ? "" : picture_style;
+  - img_style = !img_style ? "" : img_style; 
+  - var ratio = picture_style.length > 0 ? picture_style : "padding-bottom: " + (height/width)*100 + "%;" ;
+  - var img_style = img_style.length > 0 ? img_style : "";
+  - var placeholder_img = no_sources
+
+  //- If there is no source img found then a placeholder img link is supplied as the path instead 
+  - if (no_sources){
+  -   filtered_sources = [['jpg', true]];
+  -   path_nosuffix = 'http://via.placeholder.com/400';
+  -   ratio = "padding-bottom: 100%;";
+  -   img_style = "width:initial;height:initial"; 
+  -  }
+
+  picture(style=ratio).ratio-box.lazy-img
+    for i in filtered_sources 
+      - suffix = i[0]
+        source(srcset="#{path_nosuffix}.#{suffix}" type="image/#{suffix}")
+    
+    //- add src path and use suffix for images that exists
+    img(src="#{path_nosuffix}.#{preferred_src_suffix}" style=img_style).img-small--webp.lazyload
+    img(data-src="#{path_nosuffix}.#{preferred_src_suffix}" style=img_style title="#{title}" alt="#{alt}").img-large--webp.lazyload
diff --git a/templates/pupil.jade b/templates/pupil.jade
index 1a9fc553..99603dde 100644
--- a/templates/pupil.jade
+++ b/templates/pupil.jade
@@ -163,6 +163,8 @@ block main
             div.Feature.u-padTop--2
               h4 Navigate to the #[a(href='/store#pupil' title='Pupil Store - pupil configurator') store] to check all configurations,  technical specs, and download sample videos.
                   
+    
+      include includes/webp-img
 
     //- open source
     div.Site-gray-bkg
@@ -180,8 +182,7 @@ block main
           div.Grid-cell
             div.Feature
               figure.Feature-figure
-                img(class="Feature-image" src="../media/images/pupil_page/web/pupil_source_code.png" title="Pupil Plugin screenshot" alt="Pupil Plugin screenshot")
-
+                +webp-img("/media/images/pupil_page/web/pupil_source_code.png", "Pupil Plugin screenshot" , "Pupil Plugin screenshot")
 
     //- design
     div.Site-content-container
@@ -197,8 +198,7 @@ block main
           div.Grid-cell
             div.Feature
               figure.Feature-figure
-                img(class="Feature-image" src="../media/images/pupil_page/web/frame_flex.jpg" title="Pupil Headset" alt="Pupil Headset")
-
+                +webp-img("/media/images/pupil_page/web/frame_flex.jpg", "Pupil Headset" , "Pupil Headset")
 
     //- Modular & Hackable
     div.Site-gray-bkg    
@@ -210,7 +210,8 @@ block main
             div.Feature
               figure.Feature-figure
                 figure.Feature-figure
-                img(class="Feature-image" src="../media/images/pupil_page/web/dev_explo_transp.png" title="DIY Pupil Headset" alt="DIY Pupil Headset")
+                  +webp-img("/media/images/pupil_page/web/dev_explo_transp.png", "DIY Pupil Headset" , "DIY Pupil Headset")
+                  
           div.Grid-cell
             div.Feature
               h1 Modular & Hackable
diff --git a/templates/vr-ar.jade b/templates/vr-ar.jade
index 5675134c..e5353a93 100644
--- a/templates/vr-ar.jade
+++ b/templates/vr-ar.jade
@@ -7,6 +7,7 @@ block page_scripts
   script(src=contents.js['bkg_video.js'].url)
 
 block main
+
   div(id="VR-AR" class="Site-transform")
 
     div(id="Oculus-addon-cup-video-container").Background-img-top.Background-video-container 
@@ -40,6 +41,8 @@ block main
               p You can use the VR or AR hardware you already own, and augment it with our tool-free, drop-in eye tracking hardware. 
               p You can use our software platform, or roll your own. With our open source software and direct access to the raw eye video feeds you are never locked into a platform.
 
+    include includes/webp-img
+
     //- additional products
     section.Site-content-container
       div.Feature-container-column
@@ -52,30 +55,40 @@ block main
               div.Grid-cell
                 div.Feature
                 figure.Feature-figure
-                  img(class="Feature-image" src="../media/images/store_vr_ar/htcviveb.png" title="HTC Vive Binocular Add-on" alt="HTC Vive Binocular Add-on")
+                  +webp-img("/media/images/store_vr_ar/htcviveb.png", 
+                  "HTC Vive Binocular Add-on", 
+                  "HTC Vive Binocular Add-on")
                   p #[a(href="/store#vr-ar" title="Pupil Labs Store HTC Vive Binocular Add-on") HTC Vive Binocular Add-on]
               div.Grid-cell
                 div.Feature
                 figure.Feature-figure
-                  img(class="Feature-image" src="../media/images/store_vr_ar/addon_hololens.jpg" title="Microsoft Hololens Add-on" alt="Microsoft Hololens Binocular Add-on")
+                  +webp-img("/media/images/store_vr_ar/addon_hololens.jpg", 
+                  "Microsoft Hololens Binocular Add-on", 
+                  "Microsoft Hololens Binocular Add-on")
                   p #[a(href="/store#vr-ar" title="Pupil Labs Store Microsoft Hololens Binocular Add-on") Microsoft Hololens Binocular Add-on]
           div.Grid-cell.Grid-cell--full.u-textCenter
             div.Grid.Grid--gutters.Grid--1of2.Grid--bottom        
               div.Grid-cell
                 div.Feature
                 figure.Feature-figure
-                  img(class="Feature-image" src="../media/images/store_vr_ar/addon_epson_bt300b.jpg" title="Epson BT-300 Add-on" alt="Epson BT-300 Add-on")
+                  +webp-img("/media/images/store_vr_ar/addon_epson_bt300b.jpg", 
+                  "Epson BT-300 Add-on", 
+                  "Epson BT-300 Add-on")
                   p #[a(href="/store#vr-ar" title="Pupil Labs Store Epson BT-300 add-on") Epson BT-300 Add-on]
               div.Grid-cell
                 div.Feature
                 figure.Feature-figure
-                  img(class="Feature-image" src="../media/images/store_vr_ar/oculusdk2m.png" title="Oculus Rift DK2 Binocular Add-on" alt="Oculus Rift DK2 Binocular Add-on")
+                  +webp-img("/media/images/store_vr_ar/oculusdk2m.png", 
+                  "Oculus Rift DK2 Binocular Add-on", 
+                  "Oculus Rift DK2 Binocular Add-on")
                   p #[a(href="/store#vr-ar" title="Oculus Rift DK2 Binocular Add-on") Oculus Rift DK2 Binocular Add-on]
           div.Grid-cell.Grid-cell--full.u-padTop--2
             p Our add-ons give your AR/VR Headset eye tracking superpowers. Eye videos are transferred to your host via USB 2.0. 
             p The hardware is easily attached and removed. Eye cameras can run up to 120hz and have a latency of 5.7ms. Fast enough for interaction applications and detection of saccades and quick fixations.
 
 
+
+
     //- software
     section.Site-gray-bkg
       div.Site-content-container
diff --git a/yarn.lock b/yarn.lock
index f53563a2..ab8503d8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -105,6 +105,12 @@ aproba@^1.0.3, aproba@~1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/aproba/-/aproba-1.0.4.tgz#2713680775e7614c8ba186c065d4e2e52d1072c0"
 
+archive-type@^3.0.0, archive-type@^3.0.1:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/archive-type/-/archive-type-3.2.0.tgz#9cd9c006957ebe95fadad5bd6098942a813737f6"
+  dependencies:
+    file-type "^3.1.0"
+
 archy@^1.0.0, archy@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/archy/-/archy-1.0.0.tgz#f9c8c13757cc1dd7bc379ac77b2c62a5c2868c40"
@@ -147,13 +153,21 @@ array-index@^1.0.0:
     debug "^2.2.0"
     es6-symbol "^3.0.2"
 
+array-parallel@~0.1.3:
+  version "0.1.3"
+  resolved "https://registry.yarnpkg.com/array-parallel/-/array-parallel-0.1.3.tgz#8f785308926ed5aa478c47e64d1b334b6c0c947d"
+
+array-series@~0.1.5:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/array-series/-/array-series-0.1.5.tgz#df5d37bfc5c2ef0755e2aa4f92feae7d4b5a972f"
+
 array-union@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/array-union/-/array-union-1.0.2.tgz#9a34410e4f4e3da23dea375be5be70f24778ec39"
   dependencies:
     array-uniq "^1.0.1"
 
-array-uniq@^1.0.1, array-uniq@^1.0.2:
+array-uniq@^1.0.0, array-uniq@^1.0.1, array-uniq@^1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-1.0.3.tgz#af6ac877a25cc7f74e058894753858dfdb24fdb6"
 
@@ -189,11 +203,15 @@ async-each-series@0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/async-each-series/-/async-each-series-0.1.1.tgz#7617c1917401fd8ca4a28aadce3dbae98afeb432"
 
+async-each-series@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/async-each-series/-/async-each-series-1.1.0.tgz#f42fd8155d38f21a5b8ea07c28e063ed1700b138"
+
 async-each@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/async-each/-/async-each-1.0.1.tgz#19d386a1d9edc6e7c1c85d388aedbcc56d33602d"
 
-async@0.2, async@~0.2.6:
+async@0.2, async@~0.2.6, async@~0.2.8:
   version "0.2.10"
   resolved "https://registry.yarnpkg.com/async/-/async-0.2.10.tgz#b6bbe0b0674b9d719708ca38de8c237cb526c3d1"
 
@@ -676,19 +694,63 @@ bignumber.js@^2.1.0:
   version "2.4.0"
   resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-2.4.0.tgz#838a992da9f9d737e0f4b2db0be62bb09dd0c5e8"
 
+bin-build@^2.0.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/bin-build/-/bin-build-2.2.0.tgz#11f8dd61f70ffcfa2bdcaa5b46f5e8fedd4221cc"
+  dependencies:
+    archive-type "^3.0.1"
+    decompress "^3.0.0"
+    download "^4.1.2"
+    exec-series "^1.0.0"
+    rimraf "^2.2.6"
+    tempfile "^1.0.0"
+    url-regex "^3.0.0"
+
+bin-check@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/bin-check/-/bin-check-2.0.0.tgz#86f8e6f4253893df60dc316957f5af02acb05930"
+  dependencies:
+    executable "^1.0.0"
+
+bin-version-check@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/bin-version-check/-/bin-version-check-2.1.0.tgz#e4e5df290b9069f7d111324031efc13fdd11a5b0"
+  dependencies:
+    bin-version "^1.0.0"
+    minimist "^1.1.0"
+    semver "^4.0.3"
+    semver-truncate "^1.0.0"
+
+bin-version@^1.0.0:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/bin-version/-/bin-version-1.0.4.tgz#9eb498ee6fd76f7ab9a7c160436f89579435d78e"
+  dependencies:
+    find-versions "^1.0.0"
+
+bin-wrapper@^3.0.1:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/bin-wrapper/-/bin-wrapper-3.0.2.tgz#67d3306262e4b1a5f2f88ee23464f6a655677aeb"
+  dependencies:
+    bin-check "^2.0.0"
+    bin-version-check "^2.1.0"
+    download "^4.0.0"
+    each-async "^1.1.1"
+    lazy-req "^1.0.0"
+    os-filter-obj "^1.0.0"
+
 binary-extensions@^1.0.0:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.8.0.tgz#48ec8d16df4377eae5fa5884682480af4d95c774"
 
-bl@~1.0.0:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/bl/-/bl-1.0.3.tgz#fc5421a28fd4226036c3b3891a66a25bc64d226e"
+bl@^1.0.0, bl@~1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/bl/-/bl-1.1.2.tgz#fdca871a99713aa00d19e3bbba41c44787a65398"
   dependencies:
     readable-stream "~2.0.5"
 
-bl@~1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/bl/-/bl-1.1.2.tgz#fdca871a99713aa00d19e3bbba41c44787a65398"
+bl@~1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/bl/-/bl-1.0.3.tgz#fc5421a28fd4226036c3b3891a66a25bc64d226e"
   dependencies:
     readable-stream "~2.0.5"
 
@@ -825,6 +887,15 @@ buffer-shims@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/buffer-shims/-/buffer-shims-1.0.0.tgz#9978ce317388c649ad8793028c3477ef044a8b51"
 
+buffer-to-vinyl@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/buffer-to-vinyl/-/buffer-to-vinyl-1.1.0.tgz#00f15faee3ab7a1dda2cde6d9121bffdd07b2262"
+  dependencies:
+    file-type "^3.1.0"
+    readable-stream "^2.0.2"
+    uuid "^2.0.1"
+    vinyl "^1.0.0"
+
 builtin-modules@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
@@ -860,10 +931,23 @@ caniuse-db@^1.0.30000539, caniuse-db@^1.0.30000597:
   version "1.0.30000602"
   resolved "https://registry.yarnpkg.com/caniuse-db/-/caniuse-db-1.0.30000602.tgz#06b2cbfb6c3aeef7ddb18cd588043549ad1a2d4e"
 
+capture-stack-trace@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/capture-stack-trace/-/capture-stack-trace-1.0.0.tgz#4a6fa07399c26bba47f0b2496b4d0fb408c5550d"
+
 caseless@~0.11.0:
   version "0.11.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.11.0.tgz#715b96ea9841593cc33067923f5ec60ebda4f7d7"
 
+caw@^1.0.1:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/caw/-/caw-1.2.0.tgz#ffb226fe7efc547288dc62ee3e97073c212d1034"
+  dependencies:
+    get-proxy "^1.0.1"
+    is-obj "^1.0.0"
+    object-assign "^3.0.0"
+    tunnel-agent "^0.4.0"
+
 center-align@^0.1.1:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/center-align/-/center-align-0.1.3.tgz#aa0d32629b6ee972200411cbd4461c907bc2b7ad"
@@ -982,6 +1066,10 @@ cmd-shim@~2.0.2:
     graceful-fs "^4.1.2"
     mkdirp "~0.5.0"
 
+co@3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/co/-/co-3.1.0.tgz#4ea54ea5a08938153185e15210c68d9092bc1b78"
+
 code-point-at@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/code-point-at/-/code-point-at-1.1.0.tgz#0d070b4d043a5bea33a2f1a40e2edb3d9a4ccf77"
@@ -1041,7 +1129,7 @@ commander@1.0:
   dependencies:
     keypress "0.1.x"
 
-commander@2.8.x:
+commander@2.8.x, commander@~2.8.1:
   version "2.8.1"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.8.1.tgz#06be367febfda0c330aa1e2a072d3dc9762425d4"
   dependencies:
@@ -1081,7 +1169,7 @@ concat-stream@1.5.0:
     readable-stream "~2.0.0"
     typedarray "~0.0.5"
 
-concat-stream@^1.5.2:
+concat-stream@^1.4.6, concat-stream@^1.4.7, concat-stream@^1.5.2:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.6.0.tgz#0aac662fd52be78964d5532f694784e70110acf7"
   dependencies:
@@ -1127,6 +1215,10 @@ console-control-strings@^1.0.0, console-control-strings@~1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/console-control-strings/-/console-control-strings-1.1.0.tgz#3d7cf4464db6446ea644bf4b39507f9851008e8e"
 
+console-stream@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/console-stream/-/console-stream-0.1.1.tgz#a095fe07b20465955f2fafd28b5d72bccd949d44"
+
 constantinople@~3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/constantinople/-/constantinople-3.1.0.tgz#7569caa8aa3f8d5935d62e1fa96f9f702cd81c79"
@@ -1134,7 +1226,7 @@ constantinople@~3.1.0:
     acorn "^3.1.0"
     is-expression "^2.0.1"
 
-convert-source-map@^1.1.0, convert-source-map@^1.2.0:
+convert-source-map@^1.1.0, convert-source-map@^1.1.1, convert-source-map@^1.2.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.3.0.tgz#e9f3e9c6e2728efc2676696a70eb382f73106a67"
 
@@ -1150,6 +1242,19 @@ core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
+create-error-class@^3.0.1:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/create-error-class/-/create-error-class-3.0.2.tgz#06be7abef947a3f14a30fd610671d401bca8b7b6"
+  dependencies:
+    capture-stack-trace "^1.0.0"
+
+cross-spawn@^4.0.0:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-4.0.2.tgz#7b9247621c23adfdd3856004a823cbe397424d41"
+  dependencies:
+    lru-cache "^4.0.1"
+    which "^1.2.9"
+
 cryptiles@2.x.x:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/cryptiles/-/cryptiles-2.0.5.tgz#3bdfecdc608147c1c67202fa291e7dca59eaa3b8"
@@ -1188,6 +1293,14 @@ currently-unhandled@^0.4.1:
   dependencies:
     array-find-index "^1.0.1"
 
+cwebp-bin@^3.1.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/cwebp-bin/-/cwebp-bin-3.2.0.tgz#ae02df453d8c15341b1d8d499a5226bcf3bf4a6f"
+  dependencies:
+    bin-build "^2.0.0"
+    bin-wrapper "^3.0.1"
+    logalot "^2.0.0"
+
 cycle@1.0.x:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/cycle/-/cycle-1.0.3.tgz#21e80b2be8580f98b468f379430662b046c34ad2"
@@ -1241,6 +1354,66 @@ decamelize@^1.0.0, decamelize@^1.1.1, decamelize@^1.1.2:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
 
+decompress-tar@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/decompress-tar/-/decompress-tar-3.1.0.tgz#217c789f9b94450efaadc5c5e537978fc333c466"
+  dependencies:
+    is-tar "^1.0.0"
+    object-assign "^2.0.0"
+    strip-dirs "^1.0.0"
+    tar-stream "^1.1.1"
+    through2 "^0.6.1"
+    vinyl "^0.4.3"
+
+decompress-tarbz2@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/decompress-tarbz2/-/decompress-tarbz2-3.1.0.tgz#8b23935681355f9f189d87256a0f8bdd96d9666d"
+  dependencies:
+    is-bzip2 "^1.0.0"
+    object-assign "^2.0.0"
+    seek-bzip "^1.0.3"
+    strip-dirs "^1.0.0"
+    tar-stream "^1.1.1"
+    through2 "^0.6.1"
+    vinyl "^0.4.3"
+
+decompress-targz@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/decompress-targz/-/decompress-targz-3.1.0.tgz#b2c13df98166268991b715d6447f642e9696f5a0"
+  dependencies:
+    is-gzip "^1.0.0"
+    object-assign "^2.0.0"
+    strip-dirs "^1.0.0"
+    tar-stream "^1.1.1"
+    through2 "^0.6.1"
+    vinyl "^0.4.3"
+
+decompress-unzip@^3.0.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/decompress-unzip/-/decompress-unzip-3.4.0.tgz#61475b4152066bbe3fee12f9d629d15fe6478eeb"
+  dependencies:
+    is-zip "^1.0.0"
+    read-all-stream "^3.0.0"
+    stat-mode "^0.2.0"
+    strip-dirs "^1.0.0"
+    through2 "^2.0.0"
+    vinyl "^1.0.0"
+    yauzl "^2.2.1"
+
+decompress@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/decompress/-/decompress-3.0.0.tgz#af1dd50d06e3bfc432461d37de11b38c0d991bed"
+  dependencies:
+    buffer-to-vinyl "^1.0.0"
+    concat-stream "^1.4.6"
+    decompress-tar "^3.0.0"
+    decompress-tarbz2 "^3.0.0"
+    decompress-targz "^3.0.0"
+    decompress-unzip "^3.0.0"
+    stream-combiner2 "^1.1.1"
+    vinyl-assign "^1.0.1"
+    vinyl-fs "^2.2.0"
+
 deep-extend@~0.4.0:
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.4.1.tgz#efe4113d08085f4e6f9687759810f807469e2253"
@@ -1338,16 +1511,58 @@ domutils@1.5:
     dom-serializer "0"
     domelementtype "1"
 
+download@^4.0.0, download@^4.1.2:
+  version "4.4.3"
+  resolved "https://registry.yarnpkg.com/download/-/download-4.4.3.tgz#aa55fdad392d95d4b68e8c2be03e0c2aa21ba9ac"
+  dependencies:
+    caw "^1.0.1"
+    concat-stream "^1.4.7"
+    each-async "^1.0.0"
+    filenamify "^1.0.1"
+    got "^5.0.0"
+    gulp-decompress "^1.2.0"
+    gulp-rename "^1.2.0"
+    is-url "^1.2.0"
+    object-assign "^4.0.1"
+    read-all-stream "^3.0.0"
+    readable-stream "^2.0.2"
+    stream-combiner2 "^1.1.1"
+    vinyl "^1.0.0"
+    vinyl-fs "^2.2.0"
+    ware "^1.2.0"
+
 duplexer2@0.0.2:
   version "0.0.2"
   resolved "https://registry.yarnpkg.com/duplexer2/-/duplexer2-0.0.2.tgz#c614dcf67e2fb14995a91711e5a617e8a60a31db"
   dependencies:
     readable-stream "~1.1.9"
 
+duplexer2@^0.1.4, duplexer2@~0.1.0:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/duplexer2/-/duplexer2-0.1.4.tgz#8b12dab878c0d69e3e7891051662a32fc6bddcc1"
+  dependencies:
+    readable-stream "^2.0.2"
+
 duplexer@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/duplexer/-/duplexer-0.1.1.tgz#ace6ff808c1ce66b57d1ebf97977acb02334cfc1"
 
+duplexify@^3.2.0:
+  version "3.5.0"
+  resolved "https://registry.yarnpkg.com/duplexify/-/duplexify-3.5.0.tgz#1aa773002e1578457e9d9d4a50b0ccaaebcbd604"
+  dependencies:
+    end-of-stream "1.0.0"
+    inherits "^2.0.1"
+    readable-stream "^2.0.0"
+    stream-shift "^1.0.0"
+
+each-async@^1.0.0, each-async@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/each-async/-/each-async-1.1.1.tgz#dee5229bdf0ab6ba2012a395e1b869abf8813473"
+  dependencies:
+    onetime "^1.0.0"
+    set-immediate-shim "^1.0.0"
+
 easy-extender@2.3.2:
   version "2.3.2"
   resolved "https://registry.yarnpkg.com/easy-extender/-/easy-extender-2.3.2.tgz#3d3248febe2b159607316d8f9cf491c16648221d"
@@ -1382,6 +1597,12 @@ encodeurl@~1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/encodeurl/-/encodeurl-1.0.1.tgz#79e3d58655346909fe6f0f45a5de68103b294d20"
 
+end-of-stream@1.0.0, end-of-stream@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/end-of-stream/-/end-of-stream-1.0.0.tgz#d4596e702734a93e40e9af864319eabd99ff2f0e"
+  dependencies:
+    once "~1.3.0"
+
 end-of-stream@~0.1.5:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/end-of-stream/-/end-of-stream-0.1.5.tgz#8e177206c3c80837d85632e8b9359dfe8b2f6eaf"
@@ -1475,7 +1696,7 @@ escape-html@~1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/escape-html/-/escape-html-1.0.3.tgz#0258eae4d3d0c0974de1c169188ef0051d1d1988"
 
-escape-string-regexp@^1.0.0, escape-string-regexp@^1.0.2:
+escape-string-regexp@^1.0.0, escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
 
@@ -1495,6 +1716,19 @@ eventemitter3@1.x.x:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-1.2.0.tgz#1c86991d816ad1e504750e73874224ecf3bec508"
 
+exec-series@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/exec-series/-/exec-series-1.0.3.tgz#6d257a9beac482a872c7783bc8615839fc77143a"
+  dependencies:
+    async-each-series "^1.1.0"
+    object-assign "^4.1.0"
+
+executable@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/executable/-/executable-1.1.0.tgz#877980e9112f3391066da37265de7ad8434ab4d9"
+  dependencies:
+    meow "^3.1.0"
+
 exif-parser@^0.1.9:
   version "0.1.9"
   resolved "https://registry.yarnpkg.com/exif-parser/-/exif-parser-0.1.9.tgz#1d087e05fd2b079e3a8eaf8ff249978cb5f6fba7"
@@ -1526,6 +1760,12 @@ express@2.5.x:
     mkdirp "0.3.0"
     qs "0.4.x"
 
+extend-shallow@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-2.0.1.tgz#51af7d614ad9a9f610ea1bafbb989d6b1c56890f"
+  dependencies:
+    is-extendable "^0.1.0"
+
 extend@^3.0.0, extend@~3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.0.tgz#5a474353b9f3353ddd8176dfd37b91c83a46f1d4"
@@ -1589,6 +1829,13 @@ fd-slicer@~1.0.1:
   dependencies:
     pend "~1.2.0"
 
+figures@^1.3.5:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/figures/-/figures-1.7.0.tgz#cbe1e3affcf1cd44b80cadfed28dc793a9701d2e"
+  dependencies:
+    escape-string-regexp "^1.0.5"
+    object-assign "^4.1.0"
+
 file-type@^3.1.0, file-type@^3.8.0:
   version "3.9.0"
   resolved "https://registry.yarnpkg.com/file-type/-/file-type-3.9.0.tgz#257a078384d1db8087bc449d107d52a52672b9e9"
@@ -1597,6 +1844,18 @@ filename-regex@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/filename-regex/-/filename-regex-2.0.0.tgz#996e3e80479b98b9897f15a8a58b3d084e926775"
 
+filename-reserved-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/filename-reserved-regex/-/filename-reserved-regex-1.0.0.tgz#e61cf805f0de1c984567d0386dc5df50ee5af7e4"
+
+filenamify@^1.0.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/filenamify/-/filenamify-1.2.1.tgz#a9f2ffd11c503bed300015029272378f1f1365a5"
+  dependencies:
+    filename-reserved-regex "^1.0.0"
+    strip-outer "^1.0.0"
+    trim-repeated "^1.0.0"
+
 filesize@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/filesize/-/filesize-3.3.0.tgz#53149ea3460e3b2e024962a51648aa572cf98122"
@@ -1632,6 +1891,15 @@ find-up@^1.0.0:
     path-exists "^2.0.0"
     pinkie-promise "^2.0.0"
 
+find-versions@^1.0.0:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/find-versions/-/find-versions-1.2.1.tgz#cbde9f12e38575a0af1be1b9a2c5d5fd8f186b62"
+  dependencies:
+    array-uniq "^1.0.0"
+    get-stdin "^4.0.1"
+    meow "^3.5.0"
+    semver-regex "^1.0.0"
+
 findup-sync@^0.4.2:
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/findup-sync/-/findup-sync-0.4.3.tgz#40043929e7bc60adf0b7f4827c4c6e75a0deca12"
@@ -1829,6 +2097,12 @@ get-caller-file@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-1.0.2.tgz#f702e63127e7e231c160a80c1554acb70d5047e5"
 
+get-proxy@^1.0.1:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/get-proxy/-/get-proxy-1.1.0.tgz#894854491bc591b0f147d7ae570f5c678b7256eb"
+  dependencies:
+    rc "^1.1.2"
+
 get-stdin@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/get-stdin/-/get-stdin-4.0.1.tgz#b968c6b0a04384324902e8bf1a5df32579a450fe"
@@ -1859,6 +2133,13 @@ glob-parent@^2.0.0:
   dependencies:
     is-glob "^2.0.0"
 
+glob-parent@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-3.1.0.tgz#9e6af6299d8d3bd2bd40430832bd113df906c5ae"
+  dependencies:
+    is-glob "^3.1.0"
+    path-dirname "^1.0.0"
+
 glob-stream@^3.1.5:
   version "3.1.18"
   resolved "https://registry.yarnpkg.com/glob-stream/-/glob-stream-3.1.18.tgz#9170a5f12b790306fdfe598f313f8f7954fd143b"
@@ -1870,6 +2151,19 @@ glob-stream@^3.1.5:
     through2 "^0.6.1"
     unique-stream "^1.0.0"
 
+glob-stream@^5.3.2:
+  version "5.3.5"
+  resolved "https://registry.yarnpkg.com/glob-stream/-/glob-stream-5.3.5.tgz#a55665a9a8ccdc41915a87c701e32d4e016fad22"
+  dependencies:
+    extend "^3.0.0"
+    glob "^5.0.3"
+    glob-parent "^3.0.0"
+    micromatch "^2.3.7"
+    ordered-read-streams "^0.3.0"
+    through2 "^0.6.0"
+    to-absolute-glob "^0.1.1"
+    unique-stream "^2.0.2"
+
 glob-watcher@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/glob-watcher/-/glob-watcher-0.0.6.tgz#b95b4a8df74b39c83298b0c05c978b4d9a3b710b"
@@ -1919,6 +2213,16 @@ glob@^4.3.1:
     minimatch "^2.0.1"
     once "^1.3.0"
 
+glob@^5.0.3:
+  version "5.0.15"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-5.0.15.tgz#1bc936b9e02f4a603fcc222ecf7633d30b8b93b1"
+  dependencies:
+    inflight "^1.0.4"
+    inherits "2"
+    minimatch "2 || 3"
+    once "^1.3.0"
+    path-is-absolute "^1.0.0"
+
 glob@^6.0.0, glob@~6.0.1:
   version "6.0.4"
   resolved "https://registry.yarnpkg.com/glob/-/glob-6.0.4.tgz#0f08860f6a155127b2fadd4f9ce24b1aab6e4d22"
@@ -1989,13 +2293,42 @@ glogg@^1.0.0:
   dependencies:
     sparkles "^1.0.0"
 
+gm@^1.14.2:
+  version "1.23.0"
+  resolved "https://registry.yarnpkg.com/gm/-/gm-1.23.0.tgz#80a2fe9cbf131515024846444658461269f52661"
+  dependencies:
+    array-parallel "~0.1.3"
+    array-series "~0.1.5"
+    cross-spawn "^4.0.0"
+    debug "~2.2.0"
+
+got@^5.0.0:
+  version "5.7.1"
+  resolved "https://registry.yarnpkg.com/got/-/got-5.7.1.tgz#5f81635a61e4a6589f180569ea4e381680a51f35"
+  dependencies:
+    create-error-class "^3.0.1"
+    duplexer2 "^0.1.4"
+    is-redirect "^1.0.0"
+    is-retry-allowed "^1.0.0"
+    is-stream "^1.0.0"
+    lowercase-keys "^1.0.0"
+    node-status-codes "^1.0.0"
+    object-assign "^4.0.1"
+    parse-json "^2.1.0"
+    pinkie-promise "^2.0.0"
+    read-all-stream "^3.0.0"
+    readable-stream "^2.0.5"
+    timed-out "^3.0.0"
+    unzip-response "^1.0.2"
+    url-parse-lax "^1.0.0"
+
 graceful-fs@^3.0.0, graceful-fs@^3.0.2:
   version "3.0.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-3.0.11.tgz#7613c778a1afea62f25c630a086d7f3acbbdd818"
   dependencies:
     natives "^1.1.0"
 
-graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.1.9, graceful-fs@~4.1.9:
+graceful-fs@^4.0.0, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.1.9, graceful-fs@~4.1.9:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
@@ -2066,12 +2399,38 @@ gulp-concat@^2.6.1:
     through2 "^2.0.0"
     vinyl "^2.0.0"
 
+gulp-decompress@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/gulp-decompress/-/gulp-decompress-1.2.0.tgz#8eeb65a5e015f8ed8532cafe28454960626f0dc7"
+  dependencies:
+    archive-type "^3.0.0"
+    decompress "^3.0.0"
+    gulp-util "^3.0.1"
+    readable-stream "^2.0.2"
+
 gulp-favicons@^2.2.7:
   version "2.2.7"
   resolved "https://registry.yarnpkg.com/gulp-favicons/-/gulp-favicons-2.2.7.tgz#2286e02e05cee3c94c27d5abd6060cd93aa786e5"
   dependencies:
     favicons "^4.6.1"
 
+gulp-gm@~0.0.3:
+  version "0.0.8"
+  resolved "https://registry.yarnpkg.com/gulp-gm/-/gulp-gm-0.0.8.tgz#5fb69a51e6cbb449ccc3043479a691247f5db268"
+  dependencies:
+    gm "^1.14.2"
+    gulp-util "^2.2.14"
+    through2 "^0.4.1"
+
+gulp-image-resize@^0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/gulp-image-resize/-/gulp-image-resize-0.12.0.tgz#454bf42797fa781a29ee8f35484231911274c70b"
+  dependencies:
+    async "~0.2.8"
+    gulp-gm "~0.0.3"
+    lodash "~2.4.1"
+    through2 "~0.4.1"
+
 gulp-plumber@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/gulp-plumber/-/gulp-plumber-1.1.0.tgz#f12176c2d0422f60306c242fff6a01a394faba09"
@@ -2079,6 +2438,10 @@ gulp-plumber@^1.1.0:
     gulp-util "^3"
     through2 "^2"
 
+gulp-rename@^1.2.0, gulp-rename@^1.2.2:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/gulp-rename/-/gulp-rename-1.2.2.tgz#3ad4428763f05e2764dec1c67d868db275687817"
+
 gulp-rev-replace@^0.4.3:
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/gulp-rev-replace/-/gulp-rev-replace-0.4.3.tgz#72b51848f5f093ad4b77b1d2411081eb78acd46e"
@@ -2132,6 +2495,16 @@ gulp-size@^2.1.0:
     stream-counter "^1.0.0"
     through2 "^2.0.0"
 
+gulp-sourcemaps@1.6.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/gulp-sourcemaps/-/gulp-sourcemaps-1.6.0.tgz#b86ff349d801ceb56e1d9e7dc7bbcb4b7dee600c"
+  dependencies:
+    convert-source-map "^1.1.1"
+    graceful-fs "^4.1.2"
+    strip-bom "^2.0.0"
+    through2 "^2.0.0"
+    vinyl "^1.0.0"
+
 gulp-stylus@^2.6.0:
   version "2.6.0"
   resolved "https://registry.yarnpkg.com/gulp-stylus/-/gulp-stylus-2.6.0.tgz#b0b7fa4db844e6ee82b1075ca9740564696083a1"
@@ -2165,7 +2538,7 @@ gulp-uncss@^1.0.6:
     object-assign "^4.0.1"
     uncss "^0.14.1"
 
-gulp-util@*, gulp-util@^3, gulp-util@^3.0.0, gulp-util@^3.0.2, gulp-util@^3.0.6, gulp-util@^3.0.7, gulp-util@~3.0.6:
+gulp-util@*, gulp-util@^3, gulp-util@^3.0.0, gulp-util@^3.0.1, gulp-util@^3.0.2, gulp-util@^3.0.6, gulp-util@^3.0.7, gulp-util@~3.0.6:
   version "3.0.7"
   resolved "https://registry.yarnpkg.com/gulp-util/-/gulp-util-3.0.7.tgz#78925c4b8f8b49005ac01a011c557e6218941cbb"
   dependencies:
@@ -2215,6 +2588,14 @@ gulp-util@^2.2.14:
     through2 "^0.5.0"
     vinyl "^0.2.1"
 
+gulp-webp@^2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/gulp-webp/-/gulp-webp-2.3.0.tgz#c5137fa207525d19ed9cf5d0c4808996072c2ed1"
+  dependencies:
+    gulp-util "^3.0.0"
+    imagemin-webp "^3.0.1"
+    modify-error-event "^1.0.0"
+
 gulp@^3.9.1:
   version "3.9.1"
   resolved "https://registry.yarnpkg.com/gulp/-/gulp-3.9.1.tgz#571ce45928dd40af6514fc4011866016c13845b4"
@@ -2410,6 +2791,19 @@ image-size@^0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/image-size/-/image-size-0.5.0.tgz#be7aed1c37b5ac3d9ba1d66a24b4c47ff8397651"
 
+image-size@^0.5.4:
+  version "0.5.5"
+  resolved "https://registry.yarnpkg.com/image-size/-/image-size-0.5.5.tgz#09dfd4ab9d20e29eb1c3e80b8990378df9e3cb9c"
+
+imagemin-webp@^3.0.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/imagemin-webp/-/imagemin-webp-3.1.1.tgz#6b7a5fe06f0c786b9ac5754036c060c09f997ad7"
+  dependencies:
+    cwebp-bin "^3.1.0"
+    is-cwebp-readable "^1.0.0"
+    replace-ext "^0.0.1"
+    through2 "^2.0.0"
+
 immutable@3.8.1, immutable@^3.7.6:
   version "3.8.1"
   resolved "https://registry.yarnpkg.com/immutable/-/immutable-3.8.1.tgz#200807f11ab0f72710ea485542de088075f68cd2"
@@ -2486,6 +2880,12 @@ is-absolute-url@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/is-absolute-url/-/is-absolute-url-2.0.0.tgz#9c4b20b0e5c0cbef9a479a367ede6f991679f359"
 
+is-absolute@^0.1.5:
+  version "0.1.7"
+  resolved "https://registry.yarnpkg.com/is-absolute/-/is-absolute-0.1.7.tgz#847491119fccb5fb436217cc737f7faad50f603f"
+  dependencies:
+    is-relative "^0.1.0"
+
 is-absolute@^0.2.3:
   version "0.2.6"
   resolved "https://registry.yarnpkg.com/is-absolute/-/is-absolute-0.2.6.tgz#20de69f3db942ef2d87b9c2da36f172235b1b5eb"
@@ -2513,6 +2913,16 @@ is-builtin-module@^1.0.0:
   dependencies:
     builtin-modules "^1.0.0"
 
+is-bzip2@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-bzip2/-/is-bzip2-1.0.0.tgz#5ee58eaa5a2e9c80e21407bedf23ae5ac091b3fc"
+
+is-cwebp-readable@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/is-cwebp-readable/-/is-cwebp-readable-1.0.3.tgz#9a8fde2bed77f3417ae9371258c58e2ec3285118"
+  dependencies:
+    file-type "^3.1.0"
+
 is-dotfile@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-dotfile/-/is-dotfile-1.0.2.tgz#2c132383f39199f8edc268ca01b9b007d205cc4d"
@@ -2530,7 +2940,7 @@ is-expression@^2.0.1:
     acorn "~3.3.0"
     object-assign "^4.0.1"
 
-is-extendable@^0.1.1:
+is-extendable@^0.1.0, is-extendable@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/is-extendable/-/is-extendable-0.1.1.tgz#62b110e289a471418e3ec36a617d472e301dfc89"
 
@@ -2538,6 +2948,10 @@ is-extglob@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-1.0.0.tgz#ac468177c4943405a092fc8f29760c6ffc6206c0"
 
+is-extglob@^2.1.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-2.1.1.tgz#a88c02535791f02ed37c76a1b9ea9773c833f8c2"
+
 is-finite@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-finite/-/is-finite-1.0.2.tgz#cc6677695602be550ef11e8b4aa6305342b6d0aa"
@@ -2560,6 +2974,16 @@ is-glob@^2.0.0, is-glob@^2.0.1:
   dependencies:
     is-extglob "^1.0.0"
 
+is-glob@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-3.1.0.tgz#7ba5ae24217804ac70707b96922567486cc3e84a"
+  dependencies:
+    is-extglob "^2.1.0"
+
+is-gzip@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-gzip/-/is-gzip-1.0.0.tgz#6ca8b07b99c77998025900e555ced8ed80879a83"
+
 is-html@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-html/-/is-html-1.0.0.tgz#9cbbbfebd9ee11dc206683f3ecaf4df5b1633a1b"
@@ -2575,6 +2999,10 @@ is-my-json-valid@^2.12.4:
     jsonpointer "^4.0.0"
     xtend "^4.0.0"
 
+is-natural-number@^2.0.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/is-natural-number/-/is-natural-number-2.1.1.tgz#7d4c5728377ef386c3e194a9911bf57c6dc335e7"
+
 is-number-like@^1.0.3:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/is-number-like/-/is-number-like-1.0.7.tgz#a38d6b0fd2cd4282449128859eed86c03fd23552"
@@ -2588,6 +3016,10 @@ is-number@^2.0.2, is-number@^2.1.0:
   dependencies:
     kind-of "^3.0.2"
 
+is-obj@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-obj/-/is-obj-1.0.1.tgz#3e4729ac1f5fde025cd7d83a896dab9f4f67db0f"
+
 is-plain-obj@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-plain-obj/-/is-plain-obj-1.1.0.tgz#71a50c8429dfca773c92a390a4a03b39fcd51d3e"
@@ -2608,16 +3040,32 @@ is-property@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-property/-/is-property-1.0.2.tgz#57fe1c4e48474edd65b09911f26b1cd4095dda84"
 
+is-redirect@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-redirect/-/is-redirect-1.0.0.tgz#1d03dded53bd8db0f30c26e4f95d36fc7c87dc24"
+
+is-relative@^0.1.0:
+  version "0.1.3"
+  resolved "https://registry.yarnpkg.com/is-relative/-/is-relative-0.1.3.tgz#905fee8ae86f45b3ec614bc3c15c869df0876e82"
+
 is-relative@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-relative/-/is-relative-0.2.1.tgz#d27f4c7d516d175fb610db84bbeef23c3bc97aa5"
   dependencies:
     is-unc-path "^0.1.1"
 
-is-stream@^1.0.1, is-stream@^1.1.0:
+is-retry-allowed@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-retry-allowed/-/is-retry-allowed-1.1.0.tgz#11a060568b67339444033d0125a61a20d564fb34"
+
+is-stream@^1.0.0, is-stream@^1.0.1, is-stream@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
 
+is-tar@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-tar/-/is-tar-1.0.0.tgz#2f6b2e1792c1f5bb36519acaa9d65c0d26fe853d"
+
 is-typedarray@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-typedarray/-/is-typedarray-1.0.0.tgz#e479c80858df0c1b11ddda6940f96011fcda4a9a"
@@ -2628,14 +3076,26 @@ is-unc-path@^0.1.1:
   dependencies:
     unc-path-regex "^0.1.0"
 
+is-url@^1.2.0:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/is-url/-/is-url-1.2.2.tgz#498905a593bf47cc2d9e7f738372bbf7696c7f26"
+
 is-utf8@^0.2.0:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-utf8/-/is-utf8-0.2.1.tgz#4b0da1442104d1b336340e80797e865cf39f7d72"
 
+is-valid-glob@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/is-valid-glob/-/is-valid-glob-0.3.0.tgz#d4b55c69f51886f9b65c70d6c2622d37e29f48fe"
+
 is-windows@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-0.2.0.tgz#de1aa6d63ea29dd248737b69f1ff8b8002d2108c"
 
+is-zip@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-zip/-/is-zip-1.0.0.tgz#47b0a8ff4d38a76431ccfd99a8e15a4c86ba2325"
+
 isarray@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-0.0.1.tgz#8a18acfca9a8f4177e09abfc6038939b05d1eedf"
@@ -2747,6 +3207,12 @@ json-schema@0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/json-schema/-/json-schema-0.2.3.tgz#b480c892e59a2f05954ce727bd3f2a4e882f9e13"
 
+json-stable-stringify@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz#9a759d39c5f2ff503fd5300646ed445f88c4f9af"
+  dependencies:
+    jsonify "~0.0.0"
+
 json-stringify-safe@~5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
@@ -2765,6 +3231,10 @@ jsonfile@^2.1.0:
   optionalDependencies:
     graceful-fs "^4.1.6"
 
+jsonify@~0.0.0:
+  version "0.0.0"
+  resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.0.tgz#2c74b6ee41d93ca51b7b5aaee8f503631d252a73"
+
 jsonpointer@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/jsonpointer/-/jsonpointer-4.0.0.tgz#6661e161d2fc445f19f98430231343722e1fcbd5"
@@ -2818,6 +3288,16 @@ lazy-cache@^1.0.3:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/lazy-cache/-/lazy-cache-1.0.4.tgz#a1d78fc3a50474cb80845d3b3b6e1da49a446e8e"
 
+lazy-req@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/lazy-req/-/lazy-req-1.1.0.tgz#bdaebead30f8d824039ce0ce149d4daa07ba1fac"
+
+lazystream@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/lazystream/-/lazystream-1.0.0.tgz#f6995fe0f820392f61396be89462407bb77168e4"
+  dependencies:
+    readable-stream "^2.0.5"
+
 lcid@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/lcid/-/lcid-1.0.0.tgz#308accafa0bc483a3867b4b6f2b9506251d1b835"
@@ -3047,6 +3527,10 @@ lodash.isempty@^4.2.1:
   version "4.4.0"
   resolved "https://registry.yarnpkg.com/lodash.isempty/-/lodash.isempty-4.4.0.tgz#6f86cbedd8be4ec987be9aaf33c9684db1b31e7e"
 
+lodash.isequal@^4.0.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.isequal/-/lodash.isequal-4.5.0.tgz#415c4478f2bcc30120c22ce10ed3226f7d3e18e0"
+
 lodash.isfinite@^3.3.2:
   version "3.3.2"
   resolved "https://registry.yarnpkg.com/lodash.isfinite/-/lodash.isfinite-3.3.2.tgz#fb89b65a9a80281833f0b7478b3a5104f898ebb3"
@@ -3179,7 +3663,14 @@ lodash@~4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.0.1.tgz#cd8c902c9e03f2e69ce3e0e456d505ab89eb98f4"
 
-longest@^1.0.1:
+logalot@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/logalot/-/logalot-2.1.0.tgz#5f8e8c90d304edf12530951a5554abb8c5e3f552"
+  dependencies:
+    figures "^1.3.5"
+    squeak "^1.0.0"
+
+longest@^1.0.0, longest@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/longest/-/longest-1.0.1.tgz#30a0b2da38f73770e8294a0d22e6625ed77d0097"
 
@@ -3196,10 +3687,30 @@ loud-rejection@^1.0.0:
     currently-unhandled "^0.4.1"
     signal-exit "^3.0.0"
 
+lowercase-keys@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/lowercase-keys/-/lowercase-keys-1.0.0.tgz#4e3366b39e7f5457e35f1324bdf6f88d0bfc7306"
+
+lpad-align@^1.0.1:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/lpad-align/-/lpad-align-1.1.2.tgz#21f600ac1c3095c3c6e497ee67271ee08481fe9e"
+  dependencies:
+    get-stdin "^4.0.1"
+    indent-string "^2.1.0"
+    longest "^1.0.0"
+    meow "^3.3.0"
+
 lru-cache@2:
   version "2.7.3"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.7.3.tgz#6d4524e8b955f95d4f5b58851ce21dd72fb4e952"
 
+lru-cache@^4.0.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.1.tgz#622e32e82488b49279114a4f9ecf45e7cd6bba55"
+  dependencies:
+    pseudomap "^1.0.2"
+    yallist "^2.1.2"
+
 magic-string@^0.14.0:
   version "0.14.0"
   resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.14.0.tgz#57224aef1701caeed273b17a39a956e72b172462"
@@ -3234,7 +3745,7 @@ marked@~0.3.6:
   version "0.3.6"
   resolved "https://registry.yarnpkg.com/marked/-/marked-0.3.6.tgz#b2c6c618fccece4ef86c4fc6cb8a7cbf5aeda8d7"
 
-meow@^3.3.0:
+meow@^3.1.0, meow@^3.3.0, meow@^3.5.0:
   version "3.7.0"
   resolved "https://registry.yarnpkg.com/meow/-/meow-3.7.0.tgz#72cb668b425228290abbfa856892587308a801fb"
   dependencies:
@@ -3255,6 +3766,12 @@ merge-defaults@^0.2.1:
   dependencies:
     lodash "~2.4.1"
 
+merge-stream@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/merge-stream/-/merge-stream-1.0.1.tgz#4041202d508a342ba00174008df0c251b8c135e1"
+  dependencies:
+    readable-stream "^2.0.1"
+
 merge@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/merge/-/merge-1.2.0.tgz#7531e39d4949c281a66b8c5a6e0265e8b05894da"
@@ -3366,6 +3883,16 @@ mkdirp@0.5.x, "mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0, mkd
   dependencies:
     minimist "0.0.8"
 
+modify-error-event@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/modify-error-event/-/modify-error-event-1.0.0.tgz#3677c76a77164b9d81502180d5f5f9db262f1c7e"
+  dependencies:
+    modify-event "^1.0.0"
+
+modify-event@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/modify-event/-/modify-event-1.0.1.tgz#ea1314e13ff6e79389f20ad74192f621de658ad6"
+
 modify-filename@^1.0.0, modify-filename@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/modify-filename/-/modify-filename-1.1.0.tgz#9a2dec83806fbb2d975f22beec859ca26b393aa1"
@@ -3457,6 +3984,10 @@ node-rest-client@^1.5.1:
     debug "~2.2.0"
     xml2js ">=0.2.4"
 
+node-status-codes@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/node-status-codes/-/node-status-codes-1.0.0.tgz#5ae5541d024645d32a58fcddc9ceecea7ae3ac2f"
+
 node-uuid@~1.4.7:
   version "1.4.7"
   resolved "https://registry.yarnpkg.com/node-uuid/-/node-uuid-1.4.7.tgz#6da5a17668c4b3dd59623bda11cf7fa4c1f60a6f"
@@ -3643,10 +4174,14 @@ oauth-sign@~0.8.0, oauth-sign@~0.8.1:
   version "0.8.2"
   resolved "https://registry.yarnpkg.com/oauth-sign/-/oauth-sign-0.8.2.tgz#46a6ab7f0aead8deae9ec0565780b7d4efeb9d43"
 
-object-assign@4.1.0, object-assign@^4.0.1, object-assign@^4.1.0:
+object-assign@4.1.0, object-assign@^4.0.0, object-assign@^4.0.1, object-assign@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.0.tgz#7a3b3d0e98063d43f4c03f2e8ae6cd51a86883a0"
 
+object-assign@^2.0.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-2.1.1.tgz#43c36e5d569ff8e4816c4efa8be02d26967c18aa"
+
 object-assign@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-3.0.0.tgz#9bedd5ca0897949bca47e7ff408062d549f587f2"
@@ -3688,6 +4223,10 @@ once@~1.3.0, once@~1.3.3:
   dependencies:
     wrappy "1"
 
+onetime@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/onetime/-/onetime-1.1.0.tgz#a1f7838f8314c516f05ecefcbc4ccfe04b4ed789"
+
 opener@~1.4.2:
   version "1.4.2"
   resolved "https://registry.yarnpkg.com/opener/-/opener-1.4.2.tgz#b32582080042af8680c389a499175b4c54fff523"
@@ -3719,6 +4258,17 @@ ordered-read-streams@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/ordered-read-streams/-/ordered-read-streams-0.1.0.tgz#fd565a9af8eb4473ba69b6ed8a34352cb552f126"
 
+ordered-read-streams@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/ordered-read-streams/-/ordered-read-streams-0.3.0.tgz#7137e69b3298bb342247a1bbee3881c80e2fd78b"
+  dependencies:
+    is-stream "^1.0.1"
+    readable-stream "^2.0.1"
+
+os-filter-obj@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/os-filter-obj/-/os-filter-obj-1.0.3.tgz#5915330d90eced557d2d938a31c6dd214d9c63ad"
+
 os-homedir@^1.0.0, os-homedir@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-homedir/-/os-homedir-1.0.2.tgz#ffbc4988336e0e833de0c168c7ef152121aa7fb3"
@@ -3779,7 +4329,7 @@ parse-headers@^2.0.0:
     for-each "^0.3.2"
     trim "0.0.1"
 
-parse-json@^2.2.0:
+parse-json@^2.1.0, parse-json@^2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-2.2.0.tgz#f480f40434ef80741f8469099f8dea18f55a4dc9"
   dependencies:
@@ -3823,6 +4373,10 @@ path-array@^1.0.0:
   dependencies:
     array-index "^1.0.0"
 
+path-dirname@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/path-dirname/-/path-dirname-1.0.2.tgz#cc33d24d525e099a5388c0336c6e32b9160609e0"
+
 path-exists@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-2.1.0.tgz#0feb6c64f0fc518d9a754dd5efb62c7022761f4b"
@@ -3942,6 +4496,10 @@ postcss@~5.0.14:
     source-map "^0.5.5"
     supports-color "^3.1.2"
 
+prepend-http@^1.0.1:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
+
 preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
@@ -3988,6 +4546,10 @@ proto-list@~1.2.1:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/proto-list/-/proto-list-1.2.4.tgz#212d5bfe1318306a420f6402b8e26ff39647a849"
 
+pseudomap@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
+
 punycode@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
@@ -4023,7 +4585,7 @@ range-parser@~1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.0.tgz#f49be6b487894ddc40dcc94a322f611092e00d5e"
 
-rc@~1.1.6:
+rc@^1.1.2, rc@~1.1.6:
   version "1.1.6"
   resolved "https://registry.yarnpkg.com/rc/-/rc-1.1.6.tgz#43651b76b6ae53b5c802f1151fa3fc3b059969c9"
   dependencies:
@@ -4032,6 +4594,13 @@ rc@~1.1.6:
     minimist "^1.2.0"
     strip-json-comments "~1.0.4"
 
+read-all-stream@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/read-all-stream/-/read-all-stream-3.1.0.tgz#35c3e177f2078ef789ee4bfafa4373074eaef4fa"
+  dependencies:
+    pinkie-promise "^2.0.0"
+    readable-stream "^2.0.0"
+
 read-chunk@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/read-chunk/-/read-chunk-1.0.1.tgz#5f68cab307e663f19993527d9b589cace4661194"
@@ -4126,7 +4695,7 @@ readable-stream@1.1, readable-stream@~1.1.9:
     isarray "0.0.1"
     string_decoder "~0.10.x"
 
-readable-stream@^2.2.2:
+readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.4, readable-stream@^2.0.5, readable-stream@^2.2.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.2.2.tgz#a9e6fec3c7dda85f8bb1b3ba7028604556fc825e"
   dependencies:
@@ -4246,7 +4815,7 @@ repeating@^2.0.0:
   dependencies:
     is-finite "^1.0.0"
 
-replace-ext@0.0.1:
+replace-ext@0.0.1, replace-ext@^0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/replace-ext/-/replace-ext-0.0.1.tgz#29bbd92078a739f0bcce2b4ee41e837953522924"
 
@@ -4427,7 +4996,7 @@ right-align@^0.1.1:
   dependencies:
     align-text "^0.1.1"
 
-rimraf@2, rimraf@^2.2.8, rimraf@^2.5.2, rimraf@~2.5.1, rimraf@~2.5.4:
+rimraf@2, rimraf@^2.2.6, rimraf@^2.2.8, rimraf@^2.5.2, rimraf@~2.5.1, rimraf@~2.5.4:
   version "2.5.4"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.5.4.tgz#96800093cbf1a0c86bd95b4625467535c29dfa04"
   dependencies:
@@ -4462,11 +5031,27 @@ sax@>=0.6.0:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.1.tgz#7b8e656190b228e81a66aea748480d828cd2d37a"
 
+seek-bzip@^1.0.3:
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/seek-bzip/-/seek-bzip-1.0.5.tgz#cfe917cb3d274bcffac792758af53173eb1fabdc"
+  dependencies:
+    commander "~2.8.1"
+
+semver-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/semver-regex/-/semver-regex-1.0.0.tgz#92a4969065f9c70c694753d55248fc68f8f652c9"
+
+semver-truncate@^1.0.0:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/semver-truncate/-/semver-truncate-1.1.2.tgz#57f41de69707a62709a7e0104ba2117109ea47e8"
+  dependencies:
+    semver "^5.3.0"
+
 "semver@2 >=2.2.1 || 3.x || 4 || 5", "semver@2 || 3 || 4 || 5", "semver@^2.3.0 || 3.x || 4 || 5", semver@^5.1.0, semver@^5.2.0, semver@^5.3.0, semver@~5.3.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.3.0.tgz#9b2ce5d3de02d17c6012ad326aa6b4d0cf54f94f"
 
-"semver@2.x || 3.x || 4 || 5", semver@^4.1.0:
+"semver@2.x || 3.x || 4 || 5", semver@^4.0.3, semver@^4.1.0:
   version "4.3.6"
   resolved "https://registry.yarnpkg.com/semver/-/semver-4.3.6.tgz#300bc6e0e86374f7ba61068b5b1ecd57fc6532da"
 
@@ -4521,7 +5106,7 @@ set-blocking@^2.0.0, set-blocking@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
 
-set-immediate-shim@^1.0.1:
+set-immediate-shim@^1.0.0, set-immediate-shim@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/set-immediate-shim/-/set-immediate-shim-1.0.1.tgz#4b2b1b27eb808a9f8dcc481a58e5e56f599f3f61"
 
@@ -4684,6 +5269,14 @@ sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
 
+squeak@^1.0.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/squeak/-/squeak-1.3.0.tgz#33045037b64388b567674b84322a6521073916c3"
+  dependencies:
+    chalk "^1.0.0"
+    console-stream "^0.1.1"
+    lpad-align "^1.0.1"
+
 sshpk@^1.7.0:
   version "1.10.1"
   resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.10.1.tgz#30e1a5d329244974a1af61511339d595af6638b0"
@@ -4703,10 +5296,21 @@ stack-trace@0.0.x:
   version "0.0.9"
   resolved "https://registry.yarnpkg.com/stack-trace/-/stack-trace-0.0.9.tgz#a8f6eaeca90674c333e7c43953f275b451510695"
 
+stat-mode@^0.2.0:
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/stat-mode/-/stat-mode-0.2.2.tgz#e6c80b623123d7d80cf132ce538f346289072502"
+
 "statuses@>= 1.3.1 < 2", statuses@~1.3.0:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.3.1.tgz#faf51b9eb74aaef3b3acf4ad5f61abf24cb7b93e"
 
+stream-combiner2@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/stream-combiner2/-/stream-combiner2-1.1.1.tgz#fb4d8a1420ea362764e21ad4780397bebcb41cbe"
+  dependencies:
+    duplexer2 "~0.1.0"
+    readable-stream "^2.0.2"
+
 stream-consume@~0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/stream-consume/-/stream-consume-0.1.0.tgz#a41ead1a6d6081ceb79f65b061901b6d8f3d1d0f"
@@ -4715,6 +5319,10 @@ stream-counter@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/stream-counter/-/stream-counter-1.0.0.tgz#91cf2569ce4dc5061febcd7acb26394a5a114751"
 
+stream-shift@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/stream-shift/-/stream-shift-1.0.0.tgz#d5c752825e5367e786f78e18e445ea223a155952"
+
 stream-throttle@^0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/stream-throttle/-/stream-throttle-0.1.3.tgz#add57c8d7cc73a81630d31cd55d3961cfafba9c3"
@@ -4780,6 +5388,17 @@ strip-bom@^2.0.0:
   dependencies:
     is-utf8 "^0.2.0"
 
+strip-dirs@^1.0.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/strip-dirs/-/strip-dirs-1.1.1.tgz#960bbd1287844f3975a4558aa103a8255e2456a0"
+  dependencies:
+    chalk "^1.0.0"
+    get-stdin "^4.0.1"
+    is-absolute "^0.1.5"
+    is-natural-number "^2.0.0"
+    minimist "^1.1.0"
+    sum-up "^1.0.1"
+
 strip-indent@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/strip-indent/-/strip-indent-1.0.1.tgz#0c7962a6adefa7bbd4ac366460a638552ae1a0a2"
@@ -4790,6 +5409,12 @@ strip-json-comments@~1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-1.0.4.tgz#1e15fbcac97d3ee99bf2d73b4c656b082bbafb91"
 
+strip-outer@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/strip-outer/-/strip-outer-1.0.0.tgz#aac0ba60d2e90c5d4f275fd8869fd9a2d310ffb8"
+  dependencies:
+    escape-string-regexp "^1.0.2"
+
 stylus@^0.54.0:
   version "0.54.5"
   resolved "https://registry.yarnpkg.com/stylus/-/stylus-0.54.5.tgz#42b9560931ca7090ce8515a798ba9e6aa3d6dc79"
@@ -4801,6 +5426,12 @@ stylus@^0.54.0:
     sax "0.5.x"
     source-map "0.1.x"
 
+sum-up@^1.0.1:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/sum-up/-/sum-up-1.0.3.tgz#1c661f667057f63bcb7875aa1438bc162525156e"
+  dependencies:
+    chalk "^1.0.0"
+
 supports-color@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-0.2.0.tgz#d92de2694eb3f67323973d7ae3d8b55b4c22190a"
@@ -4836,6 +5467,15 @@ tar-pack@~3.3.0:
     tar "~2.2.1"
     uid-number "~0.0.6"
 
+tar-stream@^1.1.1:
+  version "1.5.4"
+  resolved "https://registry.yarnpkg.com/tar-stream/-/tar-stream-1.5.4.tgz#36549cf04ed1aee9b2a30c0143252238daf94016"
+  dependencies:
+    bl "^1.0.0"
+    end-of-stream "^1.0.0"
+    readable-stream "^2.0.0"
+    xtend "^4.0.0"
+
 tar@^2.0.0, tar@^2.2.1, tar@~2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/tar/-/tar-2.2.1.tgz#8e4d2a256c0e2185c6b18ad694aec968b83cb1d1"
@@ -4851,6 +5491,13 @@ temp@^0.8.0:
     os-tmpdir "^1.0.0"
     rimraf "~2.2.6"
 
+tempfile@^1.0.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/tempfile/-/tempfile-1.1.1.tgz#5bcc4eaecc4ab2c707d8bc11d99ccc9a2cb287f2"
+  dependencies:
+    os-tmpdir "^1.0.0"
+    uuid "^2.0.1"
+
 text-table@~0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"
@@ -4866,14 +5513,21 @@ throttleit@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/throttleit/-/throttleit-1.0.0.tgz#9e785836daf46743145a5984b6268d828528ac6c"
 
-through2@0.6.1, through2@^0.6.1:
+through2-filter@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/through2-filter/-/through2-filter-2.0.0.tgz#60bc55a0dacb76085db1f9dae99ab43f83d622ec"
+  dependencies:
+    through2 "~2.0.0"
+    xtend "~4.0.0"
+
+through2@0.6.1, through2@^0.6.0, through2@^0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/through2/-/through2-0.6.1.tgz#f742b32893e8bd26146e789e4fd2ccb2c07a717e"
   dependencies:
     readable-stream ">=1.0.27-1 <1.1.0-0"
     xtend ">=4.0.0 <4.1.0-0"
 
-through2@^0.4.2:
+through2@^0.4.1, through2@^0.4.2, through2@~0.4.1:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/through2/-/through2-0.4.2.tgz#dbf5866031151ec8352bb6c4db64a2292a840b9b"
   dependencies:
@@ -4887,7 +5541,7 @@ through2@^0.5.0:
     readable-stream "~1.0.17"
     xtend "~3.0.0"
 
-through2@^2, through2@^2.0.0, through2@^2.0.1:
+through2@^2, through2@^2.0.0, through2@^2.0.1, through2@~2.0.0:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
   dependencies:
@@ -4904,10 +5558,20 @@ time-stamp@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/time-stamp/-/time-stamp-1.0.1.tgz#9f4bd23559c9365966f3302dbba2b07c6b99b151"
 
+timed-out@^3.0.0:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/timed-out/-/timed-out-3.1.3.tgz#95860bfcc5c76c277f8f8326fd0f5b2e20eba217"
+
 tinycolor2@^1.1.2:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/tinycolor2/-/tinycolor2-1.4.1.tgz#f4fad333447bc0b07d4dc8e9209d8f39a8ac77e8"
 
+to-absolute-glob@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/to-absolute-glob/-/to-absolute-glob-0.1.1.tgz#1cdfa472a9ef50c239ee66999b662ca0eb39937f"
+  dependencies:
+    extend-shallow "^2.0.1"
+
 to-array@0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/to-array/-/to-array-0.1.4.tgz#17e6c11f73dd4f3d74cda7a4ff3238e9ad9bf890"
@@ -4940,11 +5604,17 @@ trim-newlines@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/trim-newlines/-/trim-newlines-1.0.0.tgz#5887966bb582a4503a41eb524f7d35011815a613"
 
+trim-repeated@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/trim-repeated/-/trim-repeated-1.0.0.tgz#e3646a2ea4e891312bf7eace6cfb05380bc01c21"
+  dependencies:
+    escape-string-regexp "^1.0.2"
+
 trim@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/trim/-/trim-0.0.1.tgz#5858547f6b290757ee95cccc666fb50084c460dd"
 
-tunnel-agent@~0.4.1:
+tunnel-agent@^0.4.0, tunnel-agent@~0.4.1:
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/tunnel-agent/-/tunnel-agent-0.4.3.tgz#6373db76909fe570e08d73583365ed828a74eeeb"
 
@@ -5042,14 +5712,31 @@ unique-stream@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unique-stream/-/unique-stream-1.0.0.tgz#d59a4a75427447d9aa6c91e70263f8d26a4b104b"
 
+unique-stream@^2.0.2:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/unique-stream/-/unique-stream-2.2.1.tgz#5aa003cfbe94c5ff866c4e7d668bb1c4dbadb369"
+  dependencies:
+    json-stable-stringify "^1.0.0"
+    through2-filter "^2.0.0"
+
 unpipe@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"
 
+unzip-response@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/unzip-response/-/unzip-response-1.0.2.tgz#b984f0877fc0a89c2c773cc1ef7b5b232b5b06fe"
+
 urix@^0.1.0, urix@~0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/urix/-/urix-0.1.0.tgz#da937f7a62e21fec1fd18d49b35c2935067a6c72"
 
+url-parse-lax@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/url-parse-lax/-/url-parse-lax-1.0.0.tgz#7af8f303645e9bd79a272e7a14ac68bc0609da73"
+  dependencies:
+    prepend-http "^1.0.1"
+
 url-regex@^3.0.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/url-regex/-/url-regex-3.2.0.tgz#dbad1e0c9e29e105dd0b1f09f6862f7fdb482724"
@@ -5072,6 +5759,10 @@ utils-merge@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/utils-merge/-/utils-merge-1.0.0.tgz#0294fb922bb9375153541c4f7096231f287c8af8"
 
+uuid@^2.0.1:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/uuid/-/uuid-2.0.3.tgz#67e2e863797215530dff318e5bf9dcebfd47b21a"
+
 uuid@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.0.1.tgz#6544bba2dfda8c1cf17e629a3a305e2bb1fee6c1"
@@ -5082,6 +5773,10 @@ v8flags@^2.0.2:
   dependencies:
     user-home "^1.1.1"
 
+vali-date@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/vali-date/-/vali-date-1.0.0.tgz#1b904a59609fb328ef078138420934f6b86709a6"
+
 validate-npm-package-license@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz#2804babe712ad3379459acfbe24746ab2c303fbc"
@@ -5101,6 +5796,13 @@ verror@1.3.6:
   dependencies:
     extsprintf "1.0.2"
 
+vinyl-assign@^1.0.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/vinyl-assign/-/vinyl-assign-1.2.1.tgz#4d198891b5515911d771a8cd9c5480a46a074a45"
+  dependencies:
+    object-assign "^4.0.1"
+    readable-stream "^2.0.0"
+
 vinyl-file@^1.1.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/vinyl-file/-/vinyl-file-1.3.0.tgz#aa05634d3a867ba91447bedbb34afcb26f44f6e7"
@@ -5123,6 +5825,28 @@ vinyl-fs@^0.3.0:
     through2 "^0.6.1"
     vinyl "^0.4.0"
 
+vinyl-fs@^2.2.0:
+  version "2.4.4"
+  resolved "https://registry.yarnpkg.com/vinyl-fs/-/vinyl-fs-2.4.4.tgz#be6ff3270cb55dfd7d3063640de81f25d7532239"
+  dependencies:
+    duplexify "^3.2.0"
+    glob-stream "^5.3.2"
+    graceful-fs "^4.0.0"
+    gulp-sourcemaps "1.6.0"
+    is-valid-glob "^0.3.0"
+    lazystream "^1.0.0"
+    lodash.isequal "^4.0.0"
+    merge-stream "^1.0.0"
+    mkdirp "^0.5.0"
+    object-assign "^4.0.0"
+    readable-stream "^2.0.4"
+    strip-bom "^2.0.0"
+    strip-bom-stream "^1.0.0"
+    through2 "^2.0.0"
+    through2-filter "^2.0.0"
+    vali-date "^1.0.0"
+    vinyl "^1.0.0"
+
 vinyl-sourcemaps-apply@^0.2.0, vinyl-sourcemaps-apply@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/vinyl-sourcemaps-apply/-/vinyl-sourcemaps-apply-0.2.1.tgz#ab6549d61d172c2b1b87be5c508d239c8ef87705"
@@ -5135,7 +5859,7 @@ vinyl@^0.2.1:
   dependencies:
     clone-stats "~0.0.1"
 
-vinyl@^0.4.0:
+vinyl@^0.4.0, vinyl@^0.4.3:
   version "0.4.6"
   resolved "https://registry.yarnpkg.com/vinyl/-/vinyl-0.4.6.tgz#2f356c87a550a255461f36bbeb2a5ba8bf784847"
   dependencies:
@@ -5150,7 +5874,7 @@ vinyl@^0.5.0:
     clone-stats "^0.0.1"
     replace-ext "0.0.1"
 
-vinyl@^1.1.0:
+vinyl@^1.0.0, vinyl@^1.1.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/vinyl/-/vinyl-1.2.0.tgz#5c88036cf565e5df05558bfc911f8656df218884"
   dependencies:
@@ -5178,6 +5902,12 @@ void-elements@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/void-elements/-/void-elements-2.0.1.tgz#c066afb582bb1cb4128d60ea92392e94d5e9dbec"
 
+ware@^1.2.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/ware/-/ware-1.3.0.tgz#d1b14f39d2e2cb4ab8c4098f756fe4b164e473d4"
+  dependencies:
+    wrap-fn "^0.1.0"
+
 wcwidth@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/wcwidth/-/wcwidth-1.0.1.tgz#f0b0dcf915bc5ff1528afadb2c0e17b532da2fe8"
@@ -5200,7 +5930,7 @@ which-module@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/which-module/-/which-module-1.0.0.tgz#bba63ca861948994ff307736089e3b96026c2a4f"
 
-which@1, which@^1.2.12, which@~1.2.10, which@~1.2.11:
+which@1, which@^1.2.12, which@^1.2.9, which@~1.2.10, which@~1.2.11:
   version "1.2.12"
   resolved "https://registry.yarnpkg.com/which/-/which-1.2.12.tgz#de67b5e450269f194909ef23ece4ebe416fa1192"
   dependencies:
@@ -5276,6 +6006,12 @@ wrap-ansi@^2.0.0:
     string-width "^1.0.1"
     strip-ansi "^3.0.1"
 
+wrap-fn@^0.1.0:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/wrap-fn/-/wrap-fn-0.1.5.tgz#f21b6e41016ff4a7e31720dbc63a09016bdf9845"
+  dependencies:
+    co "3.1.0"
+
 wrappy@1, wrappy@~1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
@@ -5329,7 +6065,7 @@ xmlhttprequest-ssl@1.5.3:
   version "1.5.3"
   resolved "https://registry.yarnpkg.com/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.3.tgz#185a888c04eca46c3e4070d99f7b49de3528992d"
 
-"xtend@>=4.0.0 <4.1.0-0", xtend@^4.0.0, xtend@~4.0.1:
+"xtend@>=4.0.0 <4.1.0-0", xtend@^4.0.0, xtend@~4.0.0, xtend@~4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
 
@@ -5347,6 +6083,10 @@ y18n@^3.2.0, y18n@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-3.2.1.tgz#6d15fba884c08679c0d77e88e7759e811e07fa41"
 
+yallist@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
+
 yargs-parser@^4.1.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-4.2.0.tgz#6ced869cd05a3dca6a1eaee38b68aeed4b0b4101"
@@ -5404,7 +6144,7 @@ yargs@~3.10.0:
     decamelize "^1.0.0"
     window-size "0.1.0"
 
-yauzl@2.4.1:
+yauzl@2.4.1, yauzl@^2.2.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/yauzl/-/yauzl-2.4.1.tgz#9528f442dab1b2284e58b4379bb194e22e0c4005"
   dependencies: