Print readable log messages.

Before:
![screen shot 2014-01-07 at 18 52 17](https://f.cloud.github.com/assets/112752/1864888/458bbc2a-77ff-11e3-9760-cac93ce55cd0.png)

After:
![screen shot 2014-01-07 at 19 04 57](https://f.cloud.github.com/assets/112752/1864943/f3169df0-7800-11e3-856c-c137394a26a1.png)