raw1z/amistad — pull request #30 by killthekitten (2012-06-15 14:21:25+00:00)
Title: Fix for issue with attr_accessible

I was not able to use invite method because of
```ActiveModel::MassAssignmentSecurity::Error: Can't mass-assign protected attributes: friendable_id, friend_id```

I think it's because of changes in rails 3.2.3, which been done after github's fail with attr_accessible.