Vis fix

Here how it looks now:

![screen shot 2013-11-08 at 08 11 36](https://f.cloud.github.com/assets/182921/1499054/b3a294ae-484d-11e3-990c-0fbb0350d368.png)
![screen shot 2013-11-08 at 08 12 11](https://f.cloud.github.com/assets/182921/1499055/b3a30b64-484d-11e3-9af9-202fec84535e.png)

Not perfect, but at least usable. There's a lot of ugly whitespace around the second image's x-axis label, but I don't think there's much we can do about that without converting the date to something smaller (maybe "Month YY", or something like that).