Add creation_date and modified_date to a number of REST endpoints.
Merge pull request #88 from computmaxer/auditable_mixin_rest

Add creation_date and modified_date to a number of REST endpoints.
Was not removing a pub_key from the user's key_list before deleting it
Merge pull request #89 from computmaxer/remove_pub_key_from_user_key_list

Was not removing a pub_key from the user's key_list before deleting it