Django 1.8-1.10 not actually supported

[geoff-va]

It appears Django 1.8-1.10 are not actually supported because LogoutView wasn't created until Django 1.11. So either the docs could be updated or we can add support for that class based view.

I'm not sure what else may/may not work in pre django 1.11 even if that is fixed.

This was discovered by installing the application in a django 1.8 environment and an import error occurring: ImportError: cannot import name LogoutView.

[geoff-va]

It appears the only things causing the incompatibility are the LoginView and LogoutView classes that were new in Django 1.11.

• I copied those classes from django 1.11 and added them to the compat.py file that already existed
• Updated both urls.py files to catch import errors and load the ones from compat.py if not found
• Updated views.py to do the same thing

I ran tox with python 2.7 and django 1.8.18 and all tests are passing, which is encouraging at least. Still need to run with the remaining environments.

[geoff-va]

Current WIP branch here.

[juanifioren]

Latest version dropped Django versions lower than 3.2.