This allows us to easily create script entry points, use `pip` to
install, internally fetch the `bit_verify_pkg.py` script using
Python's `pkg_resources`, etc.

[Cookiecutter][1] template
<https://github.com/ionelmc/cookiecutter-pylibrary>
was used as a base.  I have only cursorily checked the result, so it's
possible that some links are dangling and that files we don't need are
still there.

[1]: https://github.com/cookiecutter/cookiecutter