Follow migration guide
Fix compilation error: add 3rd param to Assets.at

Use false because it is the default value mentionned on the scala doc:
http://www.playframework.com/documentation/2.3.x/api/scala/index.html#controllers.Assets$
Use twirl
Fix compilation error in view: use play.data.Form
Fix compilation error: add import

Error was:
project-code/app/play/utils/meta/form/selectWidget.scala.html:15:
value filter is not a member of java.util.Map[Object,String]
Use PlayMagicForJava in order to ...

- access requestHeader
- convert field
Fix compilation error, move rest routes

I don't understand why this is needed, rest routes still available.