Only made changes to cpt-onomy.php. Cleaned up some code and comments. Added 'cpt_onomy_created_object_term_relationship' and 'cpt_onomy_deleted_object_term_relationship' actions.

Only made changes to cpt-onomy.php. Cleaned up some code and comments.
Added 'cpt_onomy_created_object_term_relationship' action, allowing
users to run code when relationships are created. Added
'cpt_onomy_deleted_object_term_relationship' action, allowing users to
run code when relationships are deleted.