Return all fields of the object when posting, nost just the id

I'm using restless as the backend for a grid widget (http://demos.kendoui.com/web/grid/index.html) with built-in crud functionality. Restless is a perfect fit for the task except that when you create new items, the Kendo Grid requires all fields of the object to be returned so that it is able to sync itself with the data. In case the database did truncate something or other kind of data massaging. I'd imagine it could be useful to other REST consumers too. The small patch below makes it happen. :)