Move diff fragment loading into DiffFragmentQueueView.
Review Request #4180 — Created May 27, 2013 and submitted
Move diff fragment loading into DiffFragmentQueueView. Diff fragment loading has been moved out of reviews.js and into a helper object. The review form and review boxes lists both instantiate this and use it to batch load diff fragments one file at a time.
Tested with both diff comments on the reviews page, and in the review form dialog.