Stop the interface

        :rtype: None

def stop(self):
        """
        Stop the interface

        :rtype: None
        """
        self.debug("()")
        # Not sure if this is necessary, but good form
        if self._is_running:
            for gpio in self.gpios:
                GPIO.remove_event_detect(gpio)
            # Cleanup - includes used numbering scheme
        GPIO.cleanup()
        # Leave audience
        try:
            self.changer.on_person_leave(self.people)
        except:
            self.exception("Failed to remove people from audience")
        super(GPIODetector, self).stop()