Remove verify_exists from URLField
Remove generic function views

The generic based function views are deprecated in django 1.5.
Replace function based views with class based views.

Update urls in templates with Django 1.5 compatible string identifiers.
Add compat module for django User model

Respect custom User models in Django 1.5
Add promo view to demo project
Merge branch 'django1.5' of git://github.com/crosbymichael/django-userena