Restructure settings (#882)

* Refactor settings into importable base.

User deployment should use 'from allianceauth.settings.base import *' in their project settings.

* Restructure tests folder.
Remove DOMAIN setting.
Use localhost for services revoked emails.

* Add missing python3.4 typing requirement
typing is included python3.5+

* Remove legacy setup comments
Remove legacy update script

allianceauth/context_processors.py

@@ -3,6 +3,5 @@ from django.conf import settings
 
 def auth_settings(request):
     return {
-        'DOMAIN': settings.DOMAIN,
         'SITE_NAME': settings.SITE_NAME,
     }