Patched and fixed oauth FB login bug

Note that this is not a clean solution and better way to should be implemented around this in future. For now the fix is done based on the issue and the patch submitted by users on DO here - http://drupal.org/node/1963174

references code4aap/drupal-aap-campaign#47
Merge branch '7.x-1.x-dev' of https://github.com/code4aap/drupal-webroot into 7.x-1.x-dev