'https://developers.facebook.com/roadmap/offline-access-removal/
We can extend the token only once per day
Normal short lived tokens last 1-2 hours
Long lived tokens (given by extending) last 60 days
**Example**::
FacebookAuthorization.extend_access_token(access_token)
:param access_token:
The access_token to extend
:returns: dict'

@classmethod
def extend_access_token(cls, access_token):

    kwargs = cls._client_info()
    kwargs['grant_type'] = 'fb_exchange_token'
    kwargs['fb_exchange_token'] = access_token
    response = cls.request('oauth/access_token', **kwargs)
    return response
