Starting point for Play 2.1

Hello,
I noticed that there is now a version of Salat that integrates with Play 2.1 & Scala 2.10, work is being tracked on [Salat Issue #57](https://github.com/novus/salat/issues/57). It would be nice to get the same treatment for play-salat.

Included is my attempt at a starting point for this work.

Let me know if I can help in any way.