increment gradle version
Merge branch 'master' of github.com:karfunkel/mod-lang-groovy into karfunkel-master

* 'master' of github.com:karfunkel/mod-lang-groovy:
  Fix for issue #9: GroovyVerticleFactory fails with ClassCastException
  Fix for issue #8: *-sources.jar will not be created
increment groovy lang version