Resource owner password

Add basic user entity with custom user provider
Allow for easy plug-in of another user provider
Create users via a command in the console
Updated docs

You may get some merge conflicts with all of these pulls, feel free to pull my master which has all of these pulls merged already.

Let me know what else you think we should do. I think all the basics are there. Next step would be to maybe create a demo Symfony 2 OAuth2 Server application, showing how to customise this bundle to your liking.