'parse access token from urlencoded str like access_token=abcxyz&expires_in=123000&other=true'

def _parse_access_token(self, resp_text):

    r = self._qs2dict(resp_text)
    access_token = r.pop('access_token')
    expires = (time.time() + float(r.pop('expires_in')))
    return JsonDict(access_token=access_token, expires=expires, **r)
