Changed all slide decks to Cobalt theme

* Changed theme for all slide decks to preferred Cobalt theme.
* Fixed headshot style selector for Cobalt theme

![Screen Shot 2013-03-15 at 9 49 32 AM](https://f.cloud.github.com/assets/352082/264225/f1c750de-8d87-11e2-8399-9a294cccc036.png)