Change the handling of new Users in the UserRepository

[wimplash]

Either my understanding of REST semantics is slightly off or backbone.js is.

I currently have a PUT handler defined on the UserRepository at /resources/user/id/{id}. This assumes an empty body on the request and returns an "empty" (contains a system-assigned id and url) user representation in the response. This User is then filled out in the client and PUT back to the same /resource/user/id/{id} path.

Backbone, on the other hand, expects a fully-populated POST to the collection at /resources/user/ for creation and a PUT to the url for an updated User at /resources/user/id/{id}.

Change the create/update model for users in UserResource to match the semantics expected by Backbone.js.