Don't use mercury for non-rich-text

![screen shot 2014-06-06 at 10 55 04](https://cloud.githubusercontent.com/assets/429876/3197832/eb0919e8-ed4f-11e3-9ab7-3d2808a14c9b.png)
![screen shot 2014-06-06 at 10 54 57](https://cloud.githubusercontent.com/assets/429876/3197833/eb0a8652-ed4f-11e3-860b-9569b7309337.png)