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.
I'm not into this name change. Currently Serializers goes from Cake arrays to JSON API, but in the future it could have separate adapters to have completely different serialization formats. Not that `toArray` is a great name, but it is generic enough to not be confusing in the future.