Move live blog quote icon out of left margin, and fix media margin top

Previously, the date-time block was intersecting with first-child elements which broke out their left margin (blockquotes, images, video). Now looks like this 

![screen shot 2014-10-10 at 11 05 46 1](https://cloud.githubusercontent.com/assets/4549425/4590874/faa55aa6-5064-11e4-8453-2b240ad182b1.png)