The first time settings are loaded, the secret key is automatically generated and saved to settings/secret.py, which is added to .gitignore. This way the secret key is kept out of base settings which are commited into the repository. Uses generation algorithm used by django startproject command.
This avoid accidential clashes when two dj-skeletor-based projects are on the same machine, and is cleaner anyways.
Also set up a test SQLite3 database in development configuration.