Changed the check to see if an object can be deleted
updated the message.
Changed the linking for parents concepts

I also corrected the message for children in the delete function
Added, removing last parent relationship link when deleting an object
changed parent to parents for removing relationship
determined the type concept/resource to unlink
Changed message when failed delete of a concept or resource
fixed merge conflicts
changed exit() to drupal_exit()
Merge pull request #10 from philsogaDGI/Smithsonian-psoga

Changed the check to see if an object can be deleted