Fix hidden pagination

The new pagination is hidden behind the edit buttons. Setting a z-index > 0 fixes this. See screenshot for the bug.
![screen shot 2013-05-21 at 15 46 39](https://f.cloud.github.com/assets/60907/542123/78d03950-c21d-11e2-878f-07cd6d7a7c9c.png)