cryptography.vectors
Load vectors from cryptography.vectors
Move cryptography.vectors to cryptography_vectors

All vectors are now stored in the subpackage in the vectors/ folder.

This package is automatically installed by setup.py test and will also
be uploaded with a matching version number by the PyPI upload task.
Fix bug in release task and style fixes

tasks.py was building tarballs/sdists that didn't actually have vectors
in because of setup.pys reliance on the cwd.
Merge pull request #795 from public/split-vectors

Split vectors into cryptography_vectors