Upgrade to Play 2.2.2 and sbt 0.13.2-M2

Both latest release of Play (2.2.2) and sbt 0.13.2-M2 contain important fixes to incremental compilation. That combination of versions yields always better results of incremental compilation when name hashing is enabled. In case of `securesocial` test, the difference is significant: instead of 5 files (in two compiler invocations) just one file is recompiled.