Hi, I've made SecureSocial compile with Play 2.1

I don't know if it works though. I'm only linking it with my own project right now, but intend to use it later on.

From within the SS Scala demo, `run` works okay (the HTML page loads) but that's all I've tested.

I'm not sure if this Pull Request makes sense though? since SS's master branch is for Play 2.0?

Related Play Framework email thread:  
https://groups.google.com/d/topic/play-framework/4bF4mnRegnQ/discussion