Merge pull request #4 from nanu2k6/master

All persistence entities should work now
added columns for player*Id
indentation, formatting
corrections
beans should return DTOs
updated RAML spec
more cautious data handling
added logger, toString
fixed removing group as option
safer group deletion
rudimentary group equals()
bean handles player infos for group
improved server-side checking before persisting rules
updated RAML
added REST API CLI test snippets
Update README.md
Update README.md
Update README.md
added FKs to schema
account for different error cases when removing groups