Avoid failing when another middleware returns HttpResponse (closes #28)
Avoid failing when another middleware returns HttpResponse (closes #28)

This doesn't allow profiling other middleware classes when they do something
which returns a direct HttpResponse but it does avoid crashing every time
something triggers a redirect.

madgeekfiend/django-devserver,mathspace/django-devserver,chriscauley/django-devserver,coagulant/django-devserver,caffodian/django-devserver,Stackdriver/django-devserver,jimmyye/django-devserver,bastianh/django-devserver,takeshineshiro/django-devserver,dcramer/django-devserver,pjdelport/django-devserver