Report number of catalog entries deleted

This is a follow on to work already merged to 2.5-dev.  During testing, it seemed wrong for the admin command for deleting catalog entries did not display feedback.  

This includes:

- Updating the manager to return the number of entries deleted.
- Updating the controller to return the information.
- Updating the binding to return the information
- Update the command to display the information.

While doing this, noticed and fixed the content catalog URL (missing trailing ``/`` ).  Added support for the correct URL and deprecated the existing one.

It might be good to explicitly state that it is a JSON document with one key "deleted" that indexes the number that got deleted.