Make list item display correctly.

Follow up of #219.

After #219, Step 5, 6, 7 becomes 1, 2, 3.

This is a workaround to make the numbered list in order, but lost the syntax highlight of yaml. 

### Before

![screenshot 2014-12-12 23 09 22](https://cloud.githubusercontent.com/assets/1000669/5413712/0970ddbe-8254-11e4-9c4f-6bca734ea423.png)

### After

![screenshot 2014-12-12 23 09 02](https://cloud.githubusercontent.com/assets/1000669/5413714/0c783fc0-8254-11e4-9fd5-eb73e968eec6.png)