Fixes a padding problem in non-date cells for timelines.

Turns this:
![before](https://cloud.githubusercontent.com/assets/99448/3572599/938506ae-0b69-11e4-87b2-e2184413832b.png)
into this:
![after](https://cloud.githubusercontent.com/assets/99448/3572602/9b95b1b8-0b69-11e4-928a-2c2b28605b0e.png)