Keep editor stats columns on the same row (bug 994656)

https://bugzilla.mozilla.org/show_bug.cgi?id=994656

Before
![screenshot 2014-07-08 13 22 02](https://cloud.githubusercontent.com/assets/211578/3513641/c89ac3dc-06c4-11e4-8fc6-68efadd6eeba.png)

After
![screenshot 2014-07-08 13 26 19](https://cloud.githubusercontent.com/assets/211578/3513658/01283162-06c5-11e4-9681-3864c5818a46.png)