many ui updates to the dashboard

- config page title now links to latest_build
- job finished times on the dashboard use [timeago](http://timeago.yarp.com/), update automagically.
- jobs are served in time order, most recent first
- some rearrangement

![screen shot 2013-07-13 at 4 11 24 pm](https://f.cloud.github.com/assets/112170/793460/b6ee0da0-ec09-11e2-837a-a9089f387bb1.png)