Different settings for development and production

[samuel-iseli]

I would like to have different settings for development and production.
We shoud have a basic settings file and variants for production, development and staging.

• put settings in a package (folder)
• have sub modules base, develop, production
• manage.py defaults to develop
• wsgi and asgi default to production
• the heroku proc script uses production to prepare db etc.

For development and unit tests it seems much easier for me to user sqlite database. Don't know how to use autogenerated test-db with postgres.
Unfortunately the current model doesn't support sqlite. Will add another issue for that..