Fix dev settings

(./manage.py was crashing without)

wifiwithme/settings/dev.py

@@ -5,6 +5,10 @@ INSTALLED_APPS += [
     'debug_toolbar',
 ]
 
+MIDDLEWARE_CLASSES += [
+    'debug_toolbar.middleware.DebugToolbarMiddleware'
+]
+
 try:
     from .local import *
 except ImportError: