Context Navigation

Changes between Initial Version and Version 1 of Ticket #18763, comment 9

initial	v1
1	1	Moved with_perm checking to the authentication backends. Current strategy is to use the top-most backend that defines `with_perm`. `django.contrib.auth.backends.ModelBackend` falls back to checking the same as was previously on the `UserManager`. This allows custom authentication backends to specify their own behaviour for `with_perm`, that takes `obj` into account.
2	2
3		It is now possible to do `User.objects.with_perm('can_delete', obj)` along with `User.objects.with_perm('can_delete').
	3	It is now possible to do `User.objects.with_perm('can_delete', obj)` along with `User.objects.with_perm('can_delete')`.
4	4
5	5	Pull request here: https://github.com/django/django/pull/2951