Configure database automatically

[ehmatthes]

Migrating and using the db should fail, because I'm only using SQLite locally, and Heroku uses Postgres. Automatically install libraries needed to use postgres, and configure settings to use this db when on heroku.

[ehmatthes]

Tasks

• [x] Run migrate once just to confirm it fails.
  • migrate works, but I believe it's using sqlite3 and will lose data on next rebuild
  • I get console output indicating it worked, but no such table error when trying to register
• [x] Add psycopg2 to requirements.txt if not already present.
• [x] Modify settings.py to use Heroku postgres db.
  • [x] Should be able to append these settings at the end, overriding any earlier local settings.

[ehmatthes]

Works!