The Dygraph labels "OK" and "ERROR" were backwards

![screen shot 2014-04-21 at 1 18 56 pm](https://cloud.githubusercontent.com/assets/3129677/2758517/3ab19d12-c992-11e3-83f5-d35214555b30.png)

The OK data points were incorrectly labeled as ERR and vice-versa.