Upgrade to Django 1.11

- Deprecation warnings using Django 1.8 are resolved.
- Deprecation warnings using Django 1.11 are resolved.

- Admin: grappelli is no longer used.
- Upgrade to django-autocomplete-light v3 (v2 is not 1.11 compatible).
  * autocomplete.modelform_factory being dropped, code uses dal Select2
    views and widgets.

cof/settings/dev.py

@@ -4,7 +4,7 @@ The settings that are not listed here are imported from .common
 """
 
 from .common import *  # NOQA
-from .common import INSTALLED_APPS, MIDDLEWARE_CLASSES
+from .common import INSTALLED_APPS, MIDDLEWARE
 
 
 EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
@@ -37,10 +37,11 @@ def show_toolbar(request):
     return DEBUG
 
 INSTALLED_APPS += ["debug_toolbar", "debug_panel"]
-MIDDLEWARE_CLASSES = (
-    ["debug_panel.middleware.DebugPanelMiddleware"]
-    + MIDDLEWARE_CLASSES
-)
+
+MIDDLEWARE = [
+    "debug_panel.middleware.DebugPanelMiddleware"
+] + MIDDLEWARE
+
 DEBUG_TOOLBAR_CONFIG = {
     'SHOW_TOOLBAR_CALLBACK': show_toolbar,
 }