update ScnSocialAuth and fix img of user becouse now PhotoUrl is empty I...

Hi! In my tests login by Github not works, I have tried to update ScnSocialAuth module and this feature works, but I have the problem with PhotoUrl, becouse now is empty..
I have tried to resolve this problem with gravatar view helper by zf2..

I have the problem with testing other features (for example module add) I don't know why..