Docker for local development

[MelissaAutumn]

Issue #339 First pass at this. I kept the apache server separate, because we can run that with a built static site. Currently though, it requires you to at least run the website building container at least once.

I'll probably need to shove in some environment variables for a more flexible setup, but it otherwise works exactly like a --watch development build, except the wsgi.py script re-writes kick in properly.