Request a new session id

def create_session(self):
        """ Request a new session id """

        url = self.build_url(self._endpoints.get('create_session'))
        response = self.con.post(url, data={'persistChanges': self.persist})
        if not response:
            raise RuntimeError('Could not create session as requested by the user.')
        data = response.json()
        self.session_id = data.get('id')

        return True