urls: restore support for django-debug-toolbar (fixes #22872)

src/authentic2/urls.py

@@ -45,5 +45,11 @@ if settings.DEBUG:
     urlpatterns += patterns('django.contrib.staticfiles.views',
         url(r'^static/(?P<path>.*)$', 'serve'),
     )
- 
+
+if settings.DEBUG and 'debug_toolbar' in settings.INSTALLED_APPS:
+    import debug_toolbar
+    urlpatterns = [
+        url(r'^__debug__/', include(debug_toolbar.urls)),
+    ] + urlpatterns
+
 urlpatterns = plugins.register_plugins_urls(urlpatterns)