Minor update to bring back check status-colors

I might be mistaking but I remember the symbols used for the checks used to be colored but they now look like this:

![checks-current](https://cloud.githubusercontent.com/assets/230500/5561120/60a19030-8dbf-11e4-9ec0-b6cdf79fb8c5.png)

This PR brings the color back as shown below. 

![new](https://cloud.githubusercontent.com/assets/230500/5561122/6b2c6eee-8dbf-11e4-86ac-ffee1abc048e.png)

An alternative approach would be to stick to the first layout screenshot and only highlighting the failed checks in red like this:

![alternative](https://cloud.githubusercontent.com/assets/230500/5561130/2253bc76-8dc0-11e4-963d-7006dabb5ba5.png)

Feedback welcome