Gevent-supporting multiprocess plugin for Nose testing framework

(Fixes this and many other issues: http://stackoverflow.com/questions/8678307/gevent-monkeypatching-breaking-multiprocessing/20947384#20947384)

• Switches from multiprocess.fork to plain subprocess.popen for worker processes (fixes module-level erroneously shared objects issues for me)
• Switched from multiprocess.Queue to JSON-RPC over HTTP for master-to-clients RPC
• This can now theoretically allow tests to be distributed to multiple machines

INSTALLING

easy_install nose-gevented-multiprocess or pip install nose-gevented-multiprocess

RUNNING / USING

Pass --gevented-processes option to Nose or set NOSE_GEVENTED_PROCESSES env var to the number of worker processes you want to have. Setting a positive number will give you exactly that number of workers. Setting -1 will make the plugin detect the number of CPUs and use that many workers. Setting -2, -3, etc. will make the plugin use all CPU cores minus (-1 -(gevented_processes)) (i.e. -2 is all but one, -3 is all but two, etc.) Default value is zero - meaning the plug in is not used.

Example:

nosetests --gevented-processes=8