update swagger_play2 to use play-2.2.0 and swagger_core-1.2.5

Update swagger_play2 to use play-2.2.0 and swagger_core-1.2.5

N.B
I have updated app name => "swagger-play2.2" - this might not be appropriate, but there are already artefacts published to maven repo as: "swagger-play2 - 1.2.5". Perhaps a diff version number '1.2.5-2' might be better?
Let me know what you think.