Update samples/scala-play2/README.md

Resolver needn't be defined, because it is defined in the play2 module.
Update samples/java-play2/README.md

Play2 module lives in maven central
Update samples/java-play2/README.md

Remove last curly brace from dependencies listing
Update samples/scala-play2/README.md

Remove last curly brace from dependencies listing
Merge pull request #94 from akkie/master

Update README files for scala-play2 and java-play2 samples