Example integration of FOSFacebookBundle and FOSUserBundle for Symfony 2.1

Much of this is stolen directly from https://github.com/ollietb/OhFOSFacebookUserBundle

Changes from ollietb/OhFOSFacebookUserBundle:

• useful git history (this is a fork of symfony/symfony-standard)
• MongoDB instead of ORM

Copy app/config/parameters.yml.dist to app/config/parameters.yml and edit.