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This was REALLY nasty, without a default app configuration, the code
in apps.py doesn't run, which is the documented hook point for
basically everything life-cycle related.

Try figuring that out when you're learning Django and wondering why
your signal handling code isn't working...

It seems the meta ordering on the Machine model was created after the
Machine migration was committed. Fix that here.

I considered altering the original Machine migration, since this looks
like an oversight, but I'd rather keep the visibility on change
history having this in its own file.

Go "full Docker" and make sure all the commands work as expected.

The tests are pep8, django's tests, and 100% code coverage.