contrib.auth.views.login() has a new parameter `redirect_authenticated_user`
to automatically redirect authenticated users visiting the login page.
Thanks to dmathieu and Alex Buchanan for the original code and to Carl Meyer
for the help and review.
Made URL application namespaces be set in the included URLconf and
instance namespaces in the call to include(). Deprecated other ways
to set application and instance namespaces.
Olivier Le Thanh Duong
Tim Graham
sujayskumar
Marten Kenbeek
Riccardo Magliocchetti