- switch to play 2.2 (change sbt version)
- use new sbt config file (remove Build.scala and add build.sbt)
- Do not use play-lessc (keep default compiler)
- compile only one less file (app-main.less) that include bootstrap and
bootstrap-theme (we can override in app-variables.less any variables
defined by boostrap)
- Clean MinifiedAssets
- Clean routes