[ci skip] :scissors: blank lines between list items.

Before

![screenshot 2014-12-16 17 29 42](https://cloud.githubusercontent.com/assets/1000669/5451229/36c259e4-8549-11e4-9126-854ef1181ad5.png)


After

![screenshot 2014-12-16 17 29 47](https://cloud.githubusercontent.com/assets/1000669/5451226/30ef1b9c-8549-11e4-9e68-e5fa1260c069.png)


Cut these blank lines to follow style with other guides.