Alternate deployment setup

Basing the docker image on internal django_baseimage, notification on
README that external deployment is temporarily broken, making required
python packages less redundant and more clear in Dockerfile and
requirements.txt, making container startup take advantage of my_init and
runit, streamlining and simplifying settings.

Signed-off-by: Aaron Browne <aaron0browne@gmail.com>
Merge pull request #62 from cbmi/alternate-deployment

Alternate deployment setup