Fix wrong function usage in MailRuResourceOwner
Added Eventbrite, Trello resource owners
Removed Symfony 2.0 hack
Removed SecurityListenerFactory check for Symfony 2.0
Facebook breaks OAuth2's specification by using expires instead of expires_in
Merge pull request #392 from XWB/facebook_hack

OAuthToken: Facebook uses "expires" instead of "expires_in"
Merge pull request #390 from XWB/cleanup

Removed Symfony 2.0 hack
Merge pull request #391 from XWB/remove_security_listener_factory_check

Removed SecurityListenerFactory check for Symfony 2.0
Merge pull request #387 from stloyd/feature/new_ro

Added Eventbrite, Trello resource owners
Some cleanup of code:
- type-hint objects when possible,
- don't use container parameter in constructor
- reduce usage of container
- remove some code duplication
- made configuration a bit more readable
Refactor code to use Symfony OptionResolver component
Fix problem with twig extension after refactoring, cleanup after review