Duplicate entry handling improved

Results page now accepting password (and recreating session)
Removed secret key from settings.py!
Improved static pages and also results page
Added about page
Improved appearance of submission page and results page
Added acknowledgement of submission
Changed password storage to use bcrypt

Plain text really not such a great idea in general
Removed duration field

I wasn't using it anyway
First effort at moving towards heroku

Reconfigure to use DATABASE_URL
Install heroku packages
Debug defaults to false unless environment variable set