Dockeeeer

An attempt towards using docker + fig. I tried to come close to a 12factor setup, using ideas and code from https://github.com/ricardokirkner/django-12factor-docker. Also tried out a few ideas discussed in webdev mailing list, like peep and whitenoise [0], along with a nginx docker image (which I don't include here, because it's not working yet)

To run:
 1. Install docker
 2. Copy local.py-dist to local.py
 3. make up
 4. visit http://127.0.0.1:8000

What do you think @jgmize ?

[0] http://whitenoise.evans.io/  
That can wait for a future PR though-- sticking with sed for now is fine with me.