Adding oauth

Im sure theres gonna be bugs in here, but, it should catch everyone up.

To use these, you need to set up an api id for either facebook or google, and put it in app/local/hybridauth.php (same style as app/config/hybridauth.php)

Then make sure, in start.php, you have local set to whatever url you are using (e.g. www.grouptopics.org)