remove unused imports
AUTH_USER_MODEL defaults to 'auth.User'

https://docs.djangoproject.com/en/1.7/ref/settings/#auth-user-model
remove unused files
urlpatterns should be a list instead of patterns()

patterns() returns a list, so this is backwards compatible
https://docs.djangoproject.com/en/dev/ref/urls/#django.conf.urls.url
pep8: reorder and clean up imports
pep8: explicit relative imports
pep8: indent code 4 spaces
simplify naming
`url` templatetag should be used instead of context['action']
remove PasswordChange.dispatch, unused
simplify Logout