Stop motors immediately. Configure motors to brake if ``brake`` is set.

def off(self, motors=None, brake=True):
        """
        Stop motors immediately. Configure motors to brake if ``brake`` is set.
        """
        motors = motors if motors is not None else self.motors.values()

        for motor in motors:
            motor._set_brake(brake)

        for motor in motors:
            motor.stop()