Super users cannot demote themselves.

commit 2300e10ca232aa4821841c0c53b72ddb44474be8
Author: John Eddie Ayson <je@bixly.com>
Date:   Thu Dec 6 19:30:25 2012 +0800

    removed user and staff options

commit 863273143b1415449146c5a29f1dab554743812b
Author: John Eddie Ayson <je@bixly.com>
Date:   Fri Nov 30 16:32:37 2012 +0800

    prevented superusers from assigning themselves a different role
Allowing you to edit user permissions from the auth_user module on the admin-backend.
Moved s3 storage subclasses within project and implementing a fix for a bug that loses django-admin static files.  With this we can remove our dependency on the third party package s3_folders.
Removing the superuser option from the user-permissions page.  The superuser option can be found on the profile edit page.
Merge branch 'master' of github.com:tendenci/tendenci