Update imports to match pyzmq; allows gevent_zeromq to be transparent.
Added explicit 2.2.0 dependancy for pyzmq
Add requirements file
Remove pyzmq test suite monkey patching.
Simplify and match api of upstream changes
green poller ready!
Update README
green poller added to cython module
added poll example
Integrate green poller
Hook into pyzmq test running wrt running green tests.
Added more conservative event watching.

Largely adopted from pyzmq:a02bb893
Add more conservative event watching to cython version.

Includes timeouts for missed events (apparent libevent bug).
Increase BlockingDetector timeout.
Merge branch 'master' into green_poller

Conflicts:
	gevent_zeromq/core.py
	gevent_zeromq/core.pyx
Moved GreenPoller to separate poll.py
Merge branch 'green_poller'
Remove python generated c file

(requires cython for compiled version now).
Bump version number to 0.2.3
Fix formatting of requirements