Update password reset URLs with post_reset_redirect (Django 1.6)

In Django 1.6, auth views are reversed by name, not by their locations in `django.contrib.auth.views`.
This causes the password reset functionality to fail, unless one includes `django.contrib.auth.urls` in project's URL patterns.

The commit that caused the change:
https://github.com/django/django/commit/4f4e9243e4cf585e32a882804084853108ef94c0