* Add source-map-loader to support source maps of dependencies

* merge with latest develop

* add ModuleConcatenationPlugin

* revert source-map-loader

* bump to 3.1 and update dev-server

* rebase to master

* rebase again

* bump webpack

* remove ModuleConcatenationPlugin, downgraded react packages, bump etwp

* ETWP rc1 only for testing

* bump ETWP and webpack 3

* bump WP3

* revert to 3.2.0

* bump sw-precache-webpack-plugin

* bump back to 3.3.0

* bump dev-server and manifest