Added files for running in a production environment. Closes #66

Dockerfile defines the docker instance to run under.
Maekfile includes handy shortcuts for building and starting the Container "correctly"
nginx.conf contains config for the nginx instance inside the container.
updated requirements.txt to include gunicorn for running the app inside the container.
supervisord.conf is the config file for supervisord which loads the app and nginx inside the Container.

Better documentation about how all this works to follow.  Opening issue #81
Updates to Makefile
Fix mailer.py mailgun method
Merge pull request #83 from cmrn/fix-mailer

Fix mailer.py mailgun method
Remove payments area access, which is still a work in progress
Merge pull request #84 from cmrn/release-prep

Remove payments area access, which is still a work in progress
Merge pull request #82 from makehackvoid/docker-config

Added files for running in a production environment. Closes #66
Freeze gunicorn version