Merge branch 'facebook'
Google+ Login
Get Google+ User Activities

After Login, you can now load the activities of a user as a PHP array.
Handle Expired Google Token

Simplistic error handling for Google API. This commit discards Google
OAuth token for any HTTP error when trying to load a user's
activities...
Some documentation update
Merge branch 'google+' into facebook
Get User's Profile Pic

may want a better method name, though...