Pass ID as well as full domain object through dndService, to support drag-drop behavior like WTD-988.
Add service to communicate data after/during a drag-and-drop, to allow drag contents to be checked during dragover, and to allow full JavaScript objects to be passed during drags (within the same window.) WTD-988.
Add spec for the drag gesture, as attached to a representation of a domain object. WTD-521.
Add empty specs for all scripts introduced for the representation component. WTD-521.
