Bind to the local port

def __bind(self):
        '''
        Bind to the local port
        '''
        # using ZMQIOLoop since we *might* need zmq in there
        install_zmq()
        self.io_loop = ZMQDefaultLoop()
        self.io_loop.make_current()
        for req_channel in self.req_channels:
            req_channel.post_fork(self._handle_payload, io_loop=self.io_loop)  # TODO: cleaner? Maybe lazily?
        try:
            self.io_loop.start()
        except (KeyboardInterrupt, SystemExit):
            # Tornado knows what to do
            pass