Move to echo 0.1.2-5a2b262b88025848021c59b0aeee1242342e8559

* Updated to sbt 0.13.5
* Bumped Play version to 2.3.0-RC2
Bumped versions of Akka and Play

* Play -> 2.3.0-RC2
* Akka -> 2.3.2
RC1
Bumped Echo, Play and Akka versions

* Echo 0.1.2
* Play 2.2.3, 2.3.0
* Akka 2.3.3
Bumped Echo to version 0.1.3
Bumped version to 0.1.4-SNAPSHOT
Merge pull request #2 from typesafehub/wip-play-2.3

Play 2.3 port