'Leave the specified room.'

def leaveMUC(self, room, nick, msg='', pfrom=None):

    if msg:
        self.xmpp.sendPresence(pshow='unavailable', pto=('%s/%s' % (room, nick)), pstatus=msg, pfrom=pfrom)
    else:
        self.xmpp.sendPresence(pshow='unavailable', pto=('%s/%s' % (room, nick)), pfrom=pfrom)
    del self.rooms[room]
