Fix setup.py for release

I could not get the existing setup.py play nice with sdist so I started from the PyPA [sample project](https://github.com/pypa/sampleproject)

- remove the 2to3 stuff since I don't think Python3 support is the focus at the moment
- remove lines in setup.py I didn't understand and seem related to uploading documentation to pythonhosted.org and creating eggs. Also from looking at joblib, it seems like generate_help needs setupegg.py to define it.

Comments welcome!