Auto-refreshing latest block on live blog cards on fronts

Woop de doo!

![screen shot 2014-10-15 at 13 11 18](https://cloud.githubusercontent.com/assets/1001642/4645099/85e1e4ce-5464-11e4-9efe-ce0ca3f446e2.png)

@sammorrisdesign Did you add the link? Any reason we can't do it in the JS?