diff --git a/package-lock.json b/package-lock.json
index ceced90..e11053a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -77,7 +77,7 @@
     },
     "acorn": {
       "version": "3.3.0",
-      "resolved": "http://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
       "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo="
     },
     "acorn-globals": {
@@ -299,7 +299,7 @@
       "dependencies": {
         "debug": {
           "version": "2.2.0",
-          "resolved": "http://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
           "integrity": "sha1-+HBX6ZWxofauaklgZkE3vFbwOdo=",
           "requires": {
             "ms": "0.7.1"
@@ -307,12 +307,12 @@
         },
         "iconv-lite": {
           "version": "0.4.13",
-          "resolved": "http://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.13.tgz",
+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.13.tgz",
           "integrity": "sha1-H4irpKsLFQjoMSrMOTRfNumS4vI="
         },
         "ms": {
           "version": "0.7.1",
-          "resolved": "http://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
           "integrity": "sha1-nNE8A62/8ltl7/3nzoZO6VIBcJg="
         },
         "qs": {
@@ -433,11 +433,6 @@
         "is-regex": "^1.0.3"
       }
     },
-    "chownr": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz",
-      "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g=="
-    },
     "clean-css": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.1.tgz",
@@ -737,7 +732,7 @@
       "dependencies": {
         "debug": {
           "version": "2.2.0",
-          "resolved": "http://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
           "integrity": "sha1-+HBX6ZWxofauaklgZkE3vFbwOdo=",
           "requires": {
             "ms": "0.7.1"
@@ -745,7 +740,7 @@
         },
         "ms": {
           "version": "0.7.1",
-          "resolved": "http://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
           "integrity": "sha1-nNE8A62/8ltl7/3nzoZO6VIBcJg="
         },
         "qs": {
@@ -789,7 +784,7 @@
       "dependencies": {
         "debug": {
           "version": "2.2.0",
-          "resolved": "http://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
           "integrity": "sha1-+HBX6ZWxofauaklgZkE3vFbwOdo=",
           "requires": {
             "ms": "0.7.1"
@@ -797,7 +792,7 @@
         },
         "ms": {
           "version": "0.7.1",
-          "resolved": "http://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
           "integrity": "sha1-nNE8A62/8ltl7/3nzoZO6VIBcJg="
         },
         "statuses": {
@@ -846,14 +841,6 @@
       "resolved": "https://registry.npmjs.org/fs-constants/-/fs-constants-1.0.0.tgz",
       "integrity": "sha512-y6OAwoSIf7FyjMIv94u+b5rdheZEjzR63GTyZJm5qh4Bi+2YgwLCcI/fPFZkL5PSixOt6ZNKm+w+Hfp/Bciwow=="
     },
-    "fs-minipass": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.5.tgz",
-      "integrity": "sha512-JhBl0skXjUPCFH7x6x61gQxrKyXsxB5gcgePLZCwfyCGGsTISMoIeObbrvVeP6Xmyaudw4TT43qV2Gz+iyd2oQ==",
-      "requires": {
-        "minipass": "^2.2.1"
-      }
-    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -1409,23 +1396,6 @@
       "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
       "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
     },
-    "minipass": {
-      "version": "2.3.5",
-      "resolved": "https://registry.npmjs.org/minipass/-/minipass-2.3.5.tgz",
-      "integrity": "sha512-Gi1W4k059gyRbyVUZQ4mEqLm0YIUiGYfvxhF6SIlk3ui1WVxMTGfGdQ2SInh3PDrRTVvPKgULkpJtT4RH10+VA==",
-      "requires": {
-        "safe-buffer": "^5.1.2",
-        "yallist": "^3.0.0"
-      }
-    },
-    "minizlib": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-1.1.1.tgz",
-      "integrity": "sha512-TrfjCjk4jLhcJyGMYymBH6oTXcWjYbUAXTHDbtnWHjZC25h0cdajHuPE1zxb4DVmu8crfh+HwH/WMuyLG0nHBg==",
-      "requires": {
-        "minipass": "^2.2.1"
-      }
-    },
     "mkdirp": {
       "version": "0.5.1",
       "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
@@ -1454,7 +1424,7 @@
       "dependencies": {
         "debug": {
           "version": "2.2.0",
-          "resolved": "http://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
           "integrity": "sha1-+HBX6ZWxofauaklgZkE3vFbwOdo=",
           "requires": {
             "ms": "0.7.1"
@@ -1475,7 +1445,7 @@
         },
         "ms": {
           "version": "0.7.1",
-          "resolved": "http://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
           "integrity": "sha1-nNE8A62/8ltl7/3nzoZO6VIBcJg="
         }
       }
@@ -1568,7 +1538,7 @@
       "dependencies": {
         "uuid": {
           "version": "2.0.3",
-          "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
           "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho="
         }
       }
@@ -1941,7 +1911,7 @@
       "dependencies": {
         "iconv-lite": {
           "version": "0.4.13",
-          "resolved": "http://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.13.tgz",
+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.13.tgz",
           "integrity": "sha1-H4irpKsLFQjoMSrMOTRfNumS4vI="
         }
       }
@@ -2052,7 +2022,7 @@
     },
     "request": {
       "version": "2.74.0",
-      "resolved": "http://registry.npmjs.org/request/-/request-2.74.0.tgz",
+      "resolved": "https://registry.npmjs.org/request/-/request-2.74.0.tgz",
       "integrity": "sha1-dpPKdou7DqXIzgjAhKRe+gW4kqs=",
       "requires": {
         "aws-sign2": "~0.6.0",
@@ -2103,7 +2073,7 @@
         },
         "form-data": {
           "version": "1.0.1",
-          "resolved": "http://registry.npmjs.org/form-data/-/form-data-1.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/form-data/-/form-data-1.0.1.tgz",
           "integrity": "sha1-rjFduaSQf6BlUCMEpm13M0de43w=",
           "requires": {
             "async": "^2.0.1",
@@ -2113,7 +2083,7 @@
         },
         "har-validator": {
           "version": "2.0.6",
-          "resolved": "http://registry.npmjs.org/har-validator/-/har-validator-2.0.6.tgz",
+          "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-2.0.6.tgz",
           "integrity": "sha1-zcvAgYgmWtEZtqWnyKtw7s+10n0=",
           "requires": {
             "chalk": "^1.1.1",
@@ -2271,7 +2241,7 @@
       "dependencies": {
         "debug": {
           "version": "2.2.0",
-          "resolved": "http://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.2.0.tgz",
           "integrity": "sha1-+HBX6ZWxofauaklgZkE3vFbwOdo=",
           "requires": {
             "ms": "0.7.1"
@@ -2279,14 +2249,14 @@
           "dependencies": {
             "ms": {
               "version": "0.7.1",
-              "resolved": "http://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.1.tgz",
               "integrity": "sha1-nNE8A62/8ltl7/3nzoZO6VIBcJg="
             }
           }
         },
         "ms": {
           "version": "0.7.2",
-          "resolved": "http://registry.npmjs.org/ms/-/ms-0.7.2.tgz",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-0.7.2.tgz",
           "integrity": "sha1-riXPJRKziFodldfwN4aNhDESR2U="
         },
         "statuses": {
@@ -2518,7 +2488,7 @@
         },
         "sax": {
           "version": "0.5.8",
-          "resolved": "http://registry.npmjs.org/sax/-/sax-0.5.8.tgz",
+          "resolved": "https://registry.npmjs.org/sax/-/sax-0.5.8.tgz",
           "integrity": "sha1-1HLbIo6zMcJQaw6MFVJK25OdEsE="
         }
       }
@@ -2534,20 +2504,76 @@
     "sylvester": {
       "version": "0.0.21",
       "resolved": "https://registry.npmjs.org/sylvester/-/sylvester-0.0.21.tgz",
-      "integrity": "sha1-KYexzivS84sNzio0OIiEv6RADqc="
+      "integrity": "sha1-KYexzivS84sNzio0OIiEv6RADqc=",
+      "optional": true
     },
     "tar": {
-      "version": "4.4.8",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.8.tgz",
-      "integrity": "sha512-LzHF64s5chPQQS0IYBn9IN5h3i98c12bo4NCO7e0sGM2llXQ3p2FGC5sdENN4cTW48O915Sh+x+EXx7XW96xYQ==",
-      "requires": {
-        "chownr": "^1.1.1",
-        "fs-minipass": "^1.2.5",
-        "minipass": "^2.3.4",
-        "minizlib": "^1.1.1",
-        "mkdirp": "^0.5.0",
-        "safe-buffer": "^5.1.2",
-        "yallist": "^3.0.2"
+      "version": "4.4.19",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.19.tgz",
+      "integrity": "sha512-a20gEsvHnWe0ygBY8JbxoM4w3SJdhc7ZAuxkLqh+nvNQN2IOt0B5lLgM490X5Hl8FF0dl0tOf2ewFYAlIFgzVA==",
+      "requires": {
+        "chownr": "^1.1.4",
+        "fs-minipass": "^1.2.7",
+        "minipass": "^2.9.0",
+        "minizlib": "^1.3.3",
+        "mkdirp": "^0.5.5",
+        "safe-buffer": "^5.2.1",
+        "yallist": "^3.1.1"
+      },
+      "dependencies": {
+        "chownr": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+          "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg=="
+        },
+        "fs-minipass": {
+          "version": "1.2.7",
+          "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.7.tgz",
+          "integrity": "sha512-GWSSJGFy4e9GUeCcbIkED+bgAoFyj7XF1mV8rma3QW4NIqX9Kyx79N/PF61H5udOV3aY1IaMLs6pGbH71nlCTA==",
+          "requires": {
+            "minipass": "^2.6.0"
+          }
+        },
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw=="
+        },
+        "minipass": {
+          "version": "2.9.0",
+          "resolved": "https://registry.npmjs.org/minipass/-/minipass-2.9.0.tgz",
+          "integrity": "sha512-wxfUjg9WebH+CUDX/CdbRlh5SmfZiy/hpkxaRI16Y9W56Pa75sWgd/rvFilSgrauD9NyFymP/+JFV3KwzIsJeg==",
+          "requires": {
+            "safe-buffer": "^5.1.2",
+            "yallist": "^3.0.0"
+          }
+        },
+        "minizlib": {
+          "version": "1.3.3",
+          "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-1.3.3.tgz",
+          "integrity": "sha512-6ZYMOEnmVsdCeTJVE0W9ZD+pVnE8h9Hma/iOwwRDsdQoePpoX56/8B6z3P9VNwppJuBKNRuFDRNRqRWexT9G9Q==",
+          "requires": {
+            "minipass": "^2.9.0"
+          }
+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+        },
+        "yallist": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+          "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
+        }
       }
     },
     "tar-stream": {
@@ -2822,11 +2848,6 @@
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
       "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
     },
-    "yallist": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.2.tgz",
-      "integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k="
-    },
     "yargs": {
       "version": "4.8.1",
       "resolved": "http://registry.npmjs.org/yargs/-/yargs-4.8.1.tgz",