Migration to Play 2.3

Change Scala and Play versions
Use play.api.mvc.Result instead of SimpleResult
Add special class with no args constructor to support Java
Cross build for 2.11 and 2.10
Merge branch 'play2.3' of github.com:xolvo/play-jsonp-filter into xolvo-play2.3

Conflicts:
	build.sbt
Merge branch 'xolvo-play2.3'