fix(build): hopefully fix the prod & aot build errors (#753)

* fix(dependencies): fix versions

* fix(build): get initial.scss back, updat some dependencies, fix resolve-url-loader warning

* fix(build): fix out, update travis build

* fix(build): revert sass-loader

* fix(build): pin sass-loader at 4.1.1

* fix(build): remove cache from travis

config/webpack.dev.js

@@ -119,6 +119,7 @@ module.exports = function (options) {
               name: 'zone.js',
               path: 'zone.js/dist/long-stack-trace-zone.js'
             },
+            'ts-helpers',
           ],
           vendor: [
             '@angular/platform-browser',