/**
	*This method calls end meeting on the specified meeting in the bigbluebutton server.
	*
	*@param meetingID -- the unique meeting identifier used to store the meeting in the bigbluebutton server
	*@param modPW -- the moderator password of the meeting
	*@param SALT -- the security salt of the bigbluebutton server
	*@param URL -- the url of the bigbluebutton server
	*
	*@return
	*	- Null if the server is unreachable
	* 	- An array containing a returncode, messageKey, message.
	*/
	public function endMeeting( $meetingID, $modPW, $URL, $SALT ) {
		$xml = bbb_wrap_simplexml_load_file( BigBlueButton::endMeetingURL( $meetingID, $modPW, $URL, $SALT ) );

		if( $xml ) { //If the xml packet returned failure it displays the message to the user
			return array('returncode' => $xml->returncode, 'message' => $xml->message, 'messageKey' => $xml->messageKey);
		}
		else { //If the server is unreachable, then prompts the user of the necessary action
			return null;
		}

	}