Python3 Support

[robgil]

Support for python3 is broken with the requirement on wsgiref 0.1.2. This version does not support python3. I was able to install all the other plugins but have not tested further.

[robgil]

It doesn't seem to be referenced anywhere. Maybe we can just remove it?

$ grep wsgiref * -R
lib/python2.7/config/Makefile:		logging bsddb bsddb/test csv importlib wsgiref \
lib/python2.7/site-packages/pip/compat/__init__.py:stdlib_pkgs = ('python', 'wsgiref')
Binary file lib/python2.7/site-packages/pip/compat/__init__.pyc matches
requirements.txt:wsgiref==0.1.2