(#3139) - less verbose travis logs

So if you've used Travis on Firefox, you've no doubt seen this:

![screenshot 2014-12-08 08 39 07](https://cloud.githubusercontent.com/assets/283842/5340048/f047e388-7eb5-11e4-8fa4-a9581b8bd7da.png)

It's basically unusable. I cannot quickly restart many jobs. Also, the detailed CouchDB logs have never helped me out once, so I wouldn't mind getting rid of them.