Remove the Django requirement from this application (cfpb#33)

We should probably only pin Wagtail in this application, and support
the version range for Django that our Wagtail version specifies.

* Remove python_2_unicode_compatible from models.py

Prep for 2.1 release

Merge pull request cfpb#31 from cfpb/support-dj22

Remove Wagtail 1.13 support, add Django 2.2 import support, and add Black for autoformatting

Update to version 1.0 and add release to CHANGELOG (cfpb#30)

Prepare for version 0.8 release

prep for 0.7 release

prep for 0.6.1 release

fix error in pypi manifest

bump version for 0.5.1 release

update setup.py for 0.5 release