Fix Facebook get_key_and_secret
version number update
Removed Django 1.3 incompatible tests
REDIRECT_FIELD_NAME setting

keys from this settings (list) are forewarded when redirecting.
version bump
save signed request in request session

Signed request may contain a lot of additional data,  like requested
fan page, user data etc.
Split facebook backend and facebook-app backend

Some people might use both
version bump
patching support
Be prepared for signed_request missing from data
Merge remote-tracking branch 'smartupz/qrees'