add mirror project to compile against scala 2.10.4 and Play Json 2.2.3

framian-json-play artifact is now compiled against Play Json 2.3.1 for both Scala 2.10.4 and 2.11.1.
framian-json-play22 artifact is a special case just to support play 2.2.x a little longer
Merge pull request #20 from dwhjames/topic/play-json-cross-build

add mirror project to compile against Scala 2.10.4 and Play Json 2.2.3