FeinCMSModelAdmin breaks when using a custom model manager

Does not use first manager in model like Django's admin does, which might conflict with the objects Manager.
Rename argument to queryset and work with it directly
Revert "Rename argument to queryset and work with it directly"

This reverts commit a102431ae519b48aa3baa822e992b1e1065fa499.
Revert "FeinCMSModelAdmin breaks when using a custom model manager"

This reverts commit 7399ad96ba6c0c367f08d427bcdf1a799dd03530.
Use _default_manager for _build_tree_structure
Mention that subclasses of feincms.models.Base should not have content field
Update base.rst
Make setuplib.py python 2.5 compatible
Merge remote-tracking branch 'webjunkie/patch-1' into next

* webjunkie/patch-1:
  Use _default_manager for _build_tree_structure
  Revert "FeinCMSModelAdmin breaks when using a custom model manager"
  Revert "Rename argument to queryset and work with it directly"
  Rename argument to queryset and work with it directly
  FeinCMSModelAdmin breaks when using a custom model manager
Merge branch 'master' into next

* master:
  Make setuplib.py python 2.5 compatible
  Update base.rst
  Mention that subclasses of feincms.models.Base should not have content field