arrow

ARROW-1535: [Python] Enable sdist tarballs to be installed

The tarballs produced by `setup.py sdist` have always been broken. This creates a tarball that can be installed assuming that the Arrow/Parquet C++ libraries are installed already on the target system.

I wanted to see if I could bundle the `cpp/cmake_modules` files without using a symlink but I couldn't figure it out; it might require subclassing the sdist cmdclass to make this work. I'm not sure having the symlink is so bad

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #1188 from wesm/ARROW-1535 and squashes the following commits:

dcc2e47d [Wes McKinney] Fix RAT excludes given changes to cmake files
310af1b7 [Wes McKinney] Move all cmake files to cpp/cmake_modules, fix up sdist tarball so it can be built/installed