Merge branch 'master' into 331-user-registration

aleksis/core/admin.py

aleksis/core/apps.py

aleksis/core/menus.py

aleksis/core/models.py

aleksis/core/preferences.py

aleksis/core/rules.py

aleksis/core/settings.py

aleksis/core/static/style.scss

aleksis/core/templates/components/materialize-chips.html

aleksis/core/templates/core/notifications.html

aleksis/core/templates/core/partials/sidenav.html

aleksis/core/templatetags/data_helpers.py

aleksis/core/tests/test_authentication_backends.py

aleksis/core/urls.py

aleksis/core/util/core_helpers.py

aleksis/core/util/middlewares.py

aleksis/core/views.py

tox.ini