Destroy templates and attributes.

Added the ability to use attributes other than 'id' in the destroy templates:

	var Person = can.Model.extend({
					findAll: "GET /groups/{groupid}/persons",
					findOne: "GET /groups/{groupid}/persons/{id}",
					create:  "POST /groups/{groupid}/persons",
					update:  "PUT  /groups/{groupid}/persons/{id}",
					destroy: "DELETE /groups/{groupid}/persons/{id}",
					…
				 },{});

	new Person({ id: 2, groupid: 4}),destroy();

I would like to be able to delete with the same way I use to update.