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This mainly defines the PUBHandler object for publishing logging messages over
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    >>> handler = PUBHandler('tcp://127.0.0.1:12345')
    >>> handler.root_topic = 'foo'
    >>> logger = logging.getLogger('foobar')
    >>> logger.setLevel(logging.DEBUG)
    >>> logger.addHandler(handler)

After this point, all messages logged by ``logger`` will be published on the
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Code adapted from StarCluster:

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        handler = PUBHandler(sock)

    Or::

        handler = PUBHandler('inproc://loc')

    These are equivalent.

    Log messages handled by this handler are broadcast with ZMQ topics
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