Add newline before code block for the syntax highlighting to work properly.

Before:
![screen shot 2013-11-22 at 13 41 13](https://f.cloud.github.com/assets/148708/1600262/8aea23c8-536b-11e3-8bc3-ab074c30f082.png)

After:
![screen shot 2013-11-22 at 13 41 21](https://f.cloud.github.com/assets/148708/1600264/906bb85c-536b-11e3-8d39-81a5c90f89e6.png)