能否增加一个缩进的功能？还是我没找到？
这样 include：

![kl2x _ewfa4xqav0 2 w7](https://cloud.githubusercontent.com/assets/14685751/19958486/99aae1de-a1da-11e6-858a-2b495c8995e6.png)

会变成这样：

![j p9yz 9_83ow 5 p8 qzra](https://cloud.githubusercontent.com/assets/14685751/19958495/b213c72c-a1da-11e6-9654-1259559d96cb.png)
