Multiline messages - like stacktrace - should be converted to html

![selection_004](https://cloud.githubusercontent.com/assets/761149/4845270/eab23e32-6042-11e4-9bde-1212850e99f4.jpg)
vs
![selection_005](https://cloud.githubusercontent.com/assets/761149/4845264/d9637862-6042-11e4-8dd5-426ed054e8e2.jpg)