Moved the bulk of the shortcut() function in django/views/defaults.py to a new...

Moved the bulk of the shortcut() function in django/views/defaults.py to a new module, django/contrib/contenttypes/views.py. As a result, django/views/defaults.py no longer relies on django.contrib.contenttypes. Of course, the shortcut() function is still available in the former module, for backwards compatibility. See the new FutureBackwardsIncompatibleChanges wiki page.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9001 bcc190cf-cafb-0310-a4f2-bffc1f526a37