Django-authority

* Add Django 2.2 support
* Add Python 3.7 support
* Various fixes around the test harness.
* Use Django's own method of auto-loading permissions modules.
* Fix Django admin incompatibility regarding a method removed years ago.
* Removed unused compatibility code.
* Fix BasePermission.assign for group permissions.

- rST fixes

- Minor fixes to the documentation and versioning.

- Added support for Django 1.11
- Drop Support for Python 3.3
- Fixed a bug with template loader

Added Migration in order to support Django 1.8
Dropped Support for Django 1.7 and lower
Remove SQL Migration Files
Documentation Updates
Fix linter issues