F/deserializers

Deserializes data passed to the CakePHP layer via an HTTP request.

Uses a custom DispatchFilter to process the json payload data and deserialize the records (into CakePHP standard data arrays) and set it to the `$this->request->data` property of the Controller.

In essence with this in place your controllers can deal and process with normal data as you would expect.
The one issue with `toArray` is it also what the deserialization process is doing. It needs a name that distinguishes itself from what the deserialzization is doing. One takes a CakeArray -> JsonAPI compliant array, other takes JsonAPI array (as that what PHP winds up dealing with it as) -> CakeArray.

I guess I'm open to a suggestions.