Makes builds page look consistent across retina/normal screens

Before:

![ember js - builds 2013-12-22 21-42-19](https://f.cloud.github.com/assets/1131196/1798936/d89b8fb2-6b7b-11e3-8ccb-e7bc42ac0a58.jpg)

![ember js - builds 2013-12-22 21-42-40](https://f.cloud.github.com/assets/1131196/1798939/e4d29384-6b7b-11e3-8c2f-ff750d85bec6.jpg)

After:

![ember js - builds 2013-12-22 21-43-02](https://f.cloud.github.com/assets/1131196/1798940/f1fb33e0-6b7b-11e3-9551-731d8caee24e.jpg)