Remove old, unused patches/ directory.
Add a bunch of maintenance scripts which were in scripts/ directory.

These are going to be removed in the next commit, but just in case they
are/were useful, I'm making a record of their existence.
Remove outdated, unused scripts/ directory.
Remove irrelevant TODO item.
Only PyPI package docs/ files necessary for Sphinx builds.

 * FIXES part of Issue #65.
   https://github.com/isislovecruft/python-gnupg/issues/65