Allow JSON response wrapping

Controller JSON output can now be maniuplated based on a configuration
option callsed 'apiAdapter' set in the config/application.json

A basic wrapper has been included and works with the current ember
release. No work has been done on sideloading as yet.

This is for #317, and works for a singluar case. Relationships haven't been considered but should ideally be sideloaded if necessary