[JENKINS-24518] Define different colors to unstable and aborted statuses

Hi,

see https://issues.jenkins-ci.org/browse/JENKINS-24518

![31-08-2014 14-21-00](https://cloud.githubusercontent.com/assets/2962963/4101737/a9179162-3102-11e4-9619-59d03a4573e1.png)