Removing sort causing re-rendering during collection.add()
Removing sort causing re-rendering during collection.add()

Found that sorted collections were re-rendering due to sort() being
called during Backbone.collection.add().  Now 'sort' events will not
trigger a re-render during adds and the add models will be inserted
at the correct index in the container element.

rotundasoftware/backbone.collectionView,rotundasoftware/backbone.collectionView,fvgoto/backbone.collectionView,fvgoto/backbone.collectionView