Distribute sdist on Pypi

[pombredanne]

The current pypi release only has Mac wheels.
Can you release a plain sdist? not everyone runs on mac ;)
Thanks!

[davidblewett]

I don't mind releasing an sdist, but things are not completely automated to build the final package that is installed. It wouldn't be as easy as pip install rure. I've documented the easiest steps here: https://github.com/davidblewett/rure-python#install .

I would appreciate some help making the packaging a little more robust; the situation for this library is a little more complicated as it doesn't actually contain any Rust code. I was able to use the existing rure C interface. The tooling being worked on in the Python community assumes the C interface is part of the current package, and calls out to cargo to build it.