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
Merge branch 'HWI/0.3'