2.6.0 Cordova

Packages bumped
Cordova fixes by @floydprice 👍

2.5.0 PropTypes as external package

react 15.5.x deprecates PropTypes: user NPM's prop-types.
Meteor 1.4.4.1

2.4.0 cordova friendly

Avoid analyzing cordova's hot code push URL: /__cordova/.

2.3.0 react-helmet 5.x, sitemap.js & humans.txt

react-helmet: 5.X API.
sitemap.xml helper has been removed in favor of sitemap.js.
humans.txt has been added as available static routes.
Replace logatim & winston with pino for universal logging, remove any logger dependency: yarn remove logatim winston; yarn add pino.
Fasten hash calculations using only content from store & WebApp.clientHash.
HTML minification: yarn add html-minifier.
In production, set <script> as async for all external scripts.