Support Facebook Graph API 2.2

[Gromph]

To support Graph API 2.2 I created a subclass, and updated the version in the urls. Is this all that should be needed? Everything seems to work ok for me so far.

class Facebook22OAuth2(Facebook2OAuth2):
"""Facebook OAuth2 authentication backend using Facebook Open Graph 2.2"""
AUTHORIZATION_URL = 'https://www.facebook.com/v2.2/dialog/oauth'
ACCESS_TOKEN_URL = 'https://graph.facebook.com/v2.2/oauth/access_token'
REVOKE_TOKEN_URL = 'https://graph.facebook.com/v2.2/{uid}/permissions'
USER_DATA_URL = 'https://graph.facebook.com/v2.2/me'

[gfranxman]

Same here, FYI. Worked like a charm.

[omab]

Sorry about the delay, I've updated it to v2.3 (which changed the message response from querystring to json).