Support Django's 1.5 AUTH_USER_MODEL feature
Switch to new {% url %} tag style.

Made easy thanks to django-future-url. Resolved two non-ASCII issue and
removed one BOM.
Fix verify_exists for ExtendedURLValidator

ExtendedURLValidator does not pass down verify_exist in it's __init__
method. But as it's super class URLValidator then sets self.verify_exists to
False, any passed value was ignored.
Allow and test against Django 1.5