Update the uses of createParentQuery to only select the id

[stopyoukid]

In OneToManyCrudController we are using createParentQuery to query for the parent item to check for existence and to assign it on the child model (https://github.com/atsid/play-crud/blob/master/app/com/atsid/play/controllers/OneToManyCrudController.java#L101). We only need the "id" property on the parent, the rest of the fields are unnecessary. It could also lead to problems with serialization if some of the fields returned from the query contain looping references.