Webpack Refactor (#39)

* Make handlebars template plugin more flexible. Add crc hash to urls. Add origin trials. Add smoketest.

* Add origin trial token documentation

* Update readme to use crc hash.

* Correct smoketest urls.

* Move templatre generation into common and add env var to generate smoke tests.

* Move vendor assets into separate bundle. Clean public directory on build. Extract and optimize css. Move back to Uglify.

* Fix extract text plugin in dev.

* Update CONFIG comment

* Added webpack file loader and lobby background.

* Copy assets directory into public folder on build. Fix file-loader config to point at copied folder.

* Fix for webpack-dev-server when copying assets.

* Fix setting environment variables on windows.