Add "latest changes" styling.

https://www.pivotaltracker.com/story/show/79185352

Before:
![screenshot 2014-11-07 15 01 13](https://cloud.githubusercontent.com/assets/109225/4954702/f7514e4c-668e-11e4-86b5-7d745c6f0cd2.png)

After:
![screenshot 2014-11-07 09 29 37](https://cloud.githubusercontent.com/assets/109225/4952573/3fe57a66-6676-11e4-83a3-c8e76df90825.png)

(ignore the missing beta image)
We had a discussion about whether we should be including the label "Updated" here, since sometimes this will be the creation date of a document, not an update date (and other existing latest feeds we have distinguish these things).  Since we don't have the information about whether it was an "Update" or a "Publish", we decided we'd just not label these updates at all at present: see https://gov-uk.atlassian.net/wiki/pages/viewpage.action?pageId=16646184&focusedCommentId=17334279#comment-17334279 for the notes on this.

Basically, I'm just suggesting deleting the "Updated " bit.