Add slider thumbnail reel feature

![screen shot 2014-10-17 at 10 49 36 am](https://cloud.githubusercontent.com/assets/2614324/4681671/38b82c50-5615-11e4-9035-0453602d5cdc.png)


I don't think the thumbnail slider should be instantiated by the slider, they don't need to be connected in this way and have the difficulties of passing thumbnail options _through_ another component.