Remove unused Shapeless dependency
Add dependency on play-json and make scope of all JSON libs 'provided'
Make FieldNames package-private for re-use in Play JSON serializer
Move helper function to json package object for re-use in Play JSON
Start implementing play-json support for Siren serialization

Achieved:
- serialization of links and actions
- moved common test data to new trait JsonBaseSpec
Implement Siren property serialization to play-json
Finish play-json serialization
Generalize parsing of JSON in JsonBaseSpec to make tests more DRY
Clean up Play-JSON serialization code
Merge pull request #1 from dwestheide/add-play-json-serialization

Add play-json serialization