Support for non-blank server root URLs

Using request.path_info instead of request.path for regex matching.
This opens support for root server URLs in the form of
'www.example.com/django_root/view_url' as opposed to 
just 'www.example.com/view_url'

More info about path vs path_info here:
https://docs.djangoproject.com/en/dev/ref/request-response/#attributes