refactor(webpack_config/config): assign process.env with fallbacks to config.js, rewrite in es6
refactor(webpack_config/config): assign process.env with fallbacks to config.js, rewrite in es6

versi786/parts-checkout,Metnew/react-semantic.ui-starter,billymcintosh/react-semantic.ui-starter,billymcintosh/react-semantic.ui-starter,versi786/parts-checkout