Update Model.js
Update Model.js

Updating deref documentation.
jontewks/falcor,Netflix/falcor,nicolasartman/falcor,michaelbpaulson/falcor,sdesai/falcor,Netflix/falcor,michaelbpaulson/falcor,sdesai/falcor,jontewks/falcor,nicolasartman/falcor