Prep for PyPI submission

Adds the needed info for submitting the package to PyPI, as far as I can tell...

There's a couple oddities that I'm not sure how to address at the moment:

* The long description is just the contents of the python/README.md file, but Markdown isn't supported on PyPI. When someone navigates to the package info on the PyPI site, they'll see the raw Markdown. The supported format is [reStructuredText](http://docutils.sourceforge.net/rst.html).
* The manifest doesn't seem able to include files from a parent directory, which means with the current setup we can't distribute the LICENSE.txt file with the package. The metadata of the package does specify the MIT license, though it lacks the copyright info.

Will close #10