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improve keys mapping documentation

5

Update mapping.asciidoc Add explanation about mapping some characters lifted from https://github.com/mawww/kakoune/issues/2553

Fix RemovedInDjango18Warning

4

`RemovedInDjango18Warning: `LogicalDeleteModelAdmin.queryset` method should be renamed `get_queryset`.` [django.contrib.admin.ModelAdmin.get_queryset](https://docs.djangoproject.com/en/1.7/ref/contrib/admin/#django.contrib.admin.ModelAdmin.get_queryset)