fix #353: new post/page empty view

Add an icon and for post and page empty view
![screen shot 2013-11-25 at 11 01 29](https://f.cloud.github.com/assets/40213/1613216/6375fec8-55d4-11e3-84e6-f41a65b98a54.png)
![screen shot 2013-11-25 at 11 01 21](https://f.cloud.github.com/assets/40213/1613217/637647d4-55d4-11e3-8e4e-d4dca6881b40.png)