Add (better) API documentation

[MannanM]

• Rename "game-controller : Game Controller" to something like "Games: Operations on game and console resources"
• Rename: "GET /v1/consoles getConsoles" to something like "GET /v1/consoles Retrieve a list of all supported game consoles"
• Rename: "App to register console games you own and share them with your co-workers." to something the explains about JSON API, OAuth, types of resources, common stuff.
• Add paragraph description to each endpoint.