Add solution to backbone tabs problem

In my solution I tried to use the events system to have the views update when the model changes. At times I felt it was tough to think "in backbone" but a few times I was pleasantly surprised. At one point I tried to dynamically update the `className` property of the tab views, but I think I determined its not possible.

Any comments would be greatly appreciated, I really like backbone and want to become more adept with it.