Revert "Add a local_settings.py file that can override config."

This was a stupid idea!

This reverts commit ee91c505a37cad8c6c9705792e7e17b5945f7b2b.
Move settings.py to settings.py.default and stop settings.py from being checked in.
When a comment is posted, check if it is Spam, and add that to the DB entry.

Starts to address #20.
Add dependency on pykismet3 to README.