Several Vkontakte Bugs:

1)Mapping doesnot work due to API violation
2)Forget to read photo field from profile
Merge pull request #447 from AlexandrL/0.3

Several Vkontakte Bugs:
Security issue: login as user with socialId === null when something goes wrong

* https://github.com/hwi/HWIOAuthBundle/issues/438
Yahoo sign request fix

* everything is fine now according to: http://oauth.googlecode.com/svn/code/javascript/example/signature.html
Merge pull request #456 from nenadalm/fixes

Fixes
Prevent SessionUnavailableException when returns back from service.
[TwitterResourceOwner] Fix link to API

Details at: https://dev.twitter.com/discussions/24239
Fix: #467, #466, #465
Merge pull request #462 from Koc/fix-session

Prevent SessionUnavailableException when returns back from service.
EntityUserProvider should implement UserProviderInterface

I tried extending `EntityUserProvider` and ran into issues because it doesn't implement `UserProviderInterface`. This fixes that.
Expose entity manager to subclasses of EntityUserProvider

This is useful for creating and persisting a user that doesn't exist
Merge pull request #483 from lmcd/0.3

Expose $em and implement UserProviderInterface in EntityUserProvider
[Bugfix] Make error description detection compliant with OAuth2
The arameter 'error_description' should be also used to detect
error message, as in the OAuth2 documentation (http://tools.ietf.org/html/rfc6749#section-4.1.2.1).

Original code by: Olivier Maridat
Added italian translations
Adding createdAt property to serialization

The createdAt property was not serialized so the isExpired() method was not working as intended.
Merge branch '0.3'
added support for the use_forward firewall config option