Link each all_translation entry to the corresponding admin page

This makes a better user experience.
Updates tests and documentation.
Django 1.6 renamed get_query_set functions to get_queryset.
Merge pull request #152 from spectras/queryset_name_change

Django 1.6 renamed get_query_set functions to get_queryset.
- For older code running on 1.6+, they took care of inheritance issues so renaming the function is fine.
- For older code running on <1.6, we stick to the old name in calls and keep an alias around.
Merge pull request #156 from SeMeKh/master

Link each all_translation entry to the corresponding admin page.