Your table looks very nice, thanks a lot for sharing. We have one in our app that is pretty similar, but not as well developed. I am considering replacing the one in our app with this one.

My only reservation is adding underscore.js to our codebase. Not that I have anything against underscore, but we already Ember, jQuery and jQuery UI. I'm hesitant to add another major dependency. How hard of a dependency is Underscore.js? Could it be easily separated.