Dockerfile for Jia and some convenience tooling (don't review yet)

This Dockerfile expects a settings.py in /etc/jia/settings.py on the host machine.  I'll include some init.d or supervisord tooling to run the docker instance on the host machine once I figure that out.
Should we add a `package.txt` file like Kronos does and use the command `cat packages.txt | xargs sudo apt-get -y install`?