NYTimes/backbone.trackit — pull request #6 by sdemjanenko (2013-11-27 18:37:49+00:00)
Title: unsavedChanges: pass a reference to the changed model

This will be useful for putting an unsavedChanges listener on a collection.
Without this I cannot associate the changed attributes with a
particular model. I am interested in having access to the model's id so
that I can batch save many models at once.