Disable parts of the timeline as the dates for them pass

As each date in the timeline passes, it will show as "disabled" to show that that item has passed. I've styled it as such:

![](https://cloud.githubusercontent.com/assets/494732/3321681/d692bfa6-f73a-11e3-8385-6b9bf4a47e23.png)

I debated doing that, but then there would still be lots of duplicated calls hiding a tiny amount of logic. I didn't think it worth adding the complexity of yet another extension method just for this one page. I can give it a try though.