Dan Swick

per a suggestion from @colleenmcginnis, it would also be helpful to display line numbers in the `highlightElements` blocks.

Rough draft is up and running here - http://codepen.io/danswick/pen/qOZbXG?editors=101

Love that demo, @peterqliu! Yeah, would definitely like to incorporate typehead. Good call.

@langsmith I don't think I've seen any other feedback about timber, so I would say that you should leave it in if it's valuable to the app.