New upstream release: 2.1.11

[Dmitry Tantsur]

Changelog:

2.1.11

    remove support for LABEL prefixes. A major feature of libzmq-3.0, the LABEL prefix, has been removed from libzmq, prior to the first stable libzmq 3.x release.
        The prefix argument to send_multipart() remains, but it continue to behave in exactly the same way as it always has on 2.1.x, simply prepending message parts.
        recv_multipart() will always return a list, because prefixes are once again indistinguishable from regular message parts.

    add Socket.poll() method, for simple polling of events on a single socket.

    no longer require monkeypatching tornado IOLoop. The ioloop.ZMQPoller class is a poller implementation that matches tornado’s expectations, and pyzmq sockets can be used with any tornado application just by specifying the use of this poller. The pyzmq IOLoop implementation now only trivially differs from tornado’s.

    It is still recommended to use ioloop.install(), which sets both the zmq and tornado global IOLoop instances to the same object, but it is no longer necessary.

( http://zeromq.github.com/pyzmq/changelog.html#changelog )