Move to pip and wheels

[Wilfred]

The Python community is moving to wheels, we would benefit significantly (through using widely supported tools) if we used wheels too.

It would allow us to use pip. Pip is being actively maintained. There doesn't seem to be much interest in adding wheel support to easy_install: https://bitbucket.org/pypa/setuptools/issue/78/add-support-for-wheels-to-setuptools

It's possible to convert eggs to wheels, so we could do this in a backwards compatible fashion: http://stackoverflow.com/q/21856048/509706 . The main challenge would be user education to stop using easy_install.