Improving the layout of the metrics

Thanks to @henryhadlow and @edds for the design, paired with @tinsilver on the implementation.

### Before

![image](https://cloud.githubusercontent.com/assets/23801/4831833/9acabbe8-5f97-11e4-88ff-7755e418183c.png)

### After

![image](https://cloud.githubusercontent.com/assets/23801/4831834/a1b49604-5f97-11e4-952c-f3ae931cec0e.png)