First draft of a RESTful api.
Add simple util class for creating new json objects.
Implement RestfulAPI.player(long) and RestfulAPI.games().
Add method for retrieving games by id.
Implement RestfulAPI.game(long).
Implement RestfulAPI.createPlayer().
Implement RestfulAPI.updatePlayer(long).
Implement RestfulAPI.deletePlayer(long).
Implement RestfulAPI.createGame().
Extract a method for updating game information in Game.java.
Implement RestfulAPI.updateGame(long).
Implement RestfulAPI.deleteGame().
Merge branch 'json-api'