Context Navigation

Changes between Initial Version and Version 1 of Ticket #10686, comment 24

initial	v1
9	9	* Tim Graham commented that the code may be [generating faulty permissions](https://github.com/django/django/pull/6861#issuecomment-240427426). I checked the behavior in a dummy project, but cannot confirm. I struggled to write a test for this, because it needs real migrations, real data etc. in the database. Please let me know if there’s an example in the existing tests that I can check (the advanced testing docs don’t mention “defining a real model in a testcase” either)
10	10	* Authors and version added are still missing – I’ll add this if it has a chance to get merged.
11		* (Changed to `class` argument to `model_name´ – I believe this is more consistent with content types & auth
	11	* (Changed to `class` argument to `model_name` – I believe this is more consistent with content types & auth