Python 3 compatibility

Hi,

I'm trying to run nosetests --randomize on both python 2.7 and python 3.4 (version of nose is 1.3.3)
Python 3 fails with this error:

    /home/bdunandlaisin/Workspace/opsfwk/.tox/py34/lib/python3.4/site-packages/nose/plugins/manager.py:395: RuntimeWarning: Unable to load plugin randomize = randomize:Randomize: No module named 'plugin'
      RuntimeWarning)
    Usage: nosetests [options]

With the given pull request, I have been able to run on python 3 (but I have not checked compatibility with older version of python).

Could you have a look in my request? (A new version on pypi would be great)

Regards,
Benoit