Default manager name 'objects' is deprecated in favor of ModelAdmin.queryset.

This allows use of custom managers and custom querysets.
Merge branch 'master' of git://github.com/josven/feincms into next

* 'master' of git://github.com/josven/feincms:
  Default manager name 'objects' is deprecated in favor of ModelAdmin.queryset.

Conflicts:
	feincms/admin/tree_editor.py
Add the code to update _cached_url values back