Renew authentication token manually.  Uses POST to /auth interface

        :param apikey: Unique identifier for authorized use of the API
        :type apikey: str or None
        :param secret: The secret password corresponding to the API key.
        :type secret: str or None
        :param email: Email to use for authentication
        :type apikey: str or None
        :param apikey: Password corresponding to email
        :type apikey: str or None
        :Returns: None

def auth_refresh(self, apikey=None, secret=None, email=None, password=None):
        """
        Renew authentication token manually.  Uses POST to /auth interface

        :param apikey: Unique identifier for authorized use of the API
        :type apikey: str or None
        :param secret: The secret password corresponding to the API key.
        :type secret: str or None
        :param email: Email to use for authentication
        :type apikey: str or None
        :param apikey: Password corresponding to email
        :type apikey: str or None
        :Returns: None
        """
        jwt = self.auth_token(apikey=apikey, secret=secret, email=email, password=password)
        self._headers["Authorization"] = "Bearer %s" % jwt

        self._auth_token = jwt
        self._last_auth = datetime.utcnow()