automate Django setup

[daviddahl]

We should write a script that completely automates the Django setup by:

• checking for virtualenv and installing if need be
• create a virtualenv in ~/.env-pagelab || <path>
• install requirements.txt
• prompt user for DJANGO_DB_NAME, DJANGO_DB_PASSWORD, etc
• write config in settings_local.py
• provide a start script that does source ~/.env-pagelab/bin/activate first
• figure out how best to talk to postgresql
• runs ./manage.py migrate
• runs ./manage.py loaddata reports/fixtures/$NEW_FIXTURE_WITH_24_URLS_OR_SOMETHING.json
• runs ./manage.py collectstatic
• generate gunicorn start script for supervisorctl
• generate 'httpd' config
• create a docker image that knows how to consume all of these artifacts