Bumped Scala, Play, and Akka versions

* Akka 2.2.1 -> 2.2.4
* Play 2.1.4 -> 2.1.5
       2.2.0 -> 2.2.2
* Scala 2.10.2 -> 2.10.3
* Updated tests
Merge pull request #5 from typesafehub/bump-versions

Bumped Scala, Play, and Akka versions