Added more consistent normalizing of django-style package names with dashes
Updated changelog
Added support for django settings files
Fixed 'unneeded:' reporting. I forgot to add the django imports there.

I also added more logging.
I also use the existing db.resolvePkgNames() call in the two places where it was missing before.
Merge pull request #12 from reinout/reinout-django

Added extraction of useful info from django settings files.