* Added YUI support using modified version of [WilcoFiers/UseYUI-for-RequireJS](https://github.com/WilcoFiers/UseYUI-for-RequireJS).
* Removed jQuery, Backbone.js and Underscore.js.
* Replaced separate RequireJS with Play Framework built-in support (using @helper.requireJs).
* Upgraded to the latest Play Framework 2.2.1 version (including the replacement of Build.scala by build.sbt).