Fixed #903 -- Added login_url argument to user_passes_test view decorator. Didn't add it to login_required decorator because that would turn login_required into a callable decorator, which would break backwards compatibility.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@1440 bcc190cf-cafb-0310-a4f2-bffc1f526a37