Updated Echo to latest Scala, Play, and Akka

* Scala 2.10.4, 2.11.1
* Akka 2.2.4, 2.3.3
* Play 2.2.3, 2.3.0
Merge pull request #8 from typesafehub/v0.1.2

Updated Echo to latest Scala, Play, and Akka