added support to scala 2.10.3, akka 2.2.3, play 2.2.1 and spray 1.2.0

Hi,

I am using your project with Play framework. Unfortunately, after an update in akka and play to move concurrent classes to Scala dist. The proposed patch is working for me. Feel free to reject it, but I believe some people may ask updates to you. 

Btw, thanks a lot for spend time building this api.