setup.py: Set stats to "Alpha".
Make setupext.janitor a module instead of a package.

This means that we cannot add new modules under janitor but I'm not
too concerned about extensibility here.  It's much cleaner than having
all of your implementation buried in an __init__.py.
Add support for removing virtual environment directories.
Bumps for the 0.0.3 release.
Merge pull request #3 from dave-shawley/add-venv-cleanup

Remove virtual environments