Changes:
* Many fixes to the ZeroMQ hub, which now requires version 2.0.10 or later
* ZeroMQ hub no longer depends on pollhub, and thus works on Windows
* Better handling of connect errors on Windows
* More-robust Event delivery
* wsgi.py now distinguishes between an empty query string ("") and a
non-existent query string (no entry in environ)
* wsgi.py handles ipv6 correctly
* Better behavior in tpool when you give it nonsensical numbers
* Fixed importing on 2.5
* Hub doesn't hold on to invalid fds
* Documentation for eventlet.green.zmq.
PR: ports/154290
Submitted by: C-S <c-s@c-s.li> (maintainer)
Feature safe: yes
