Wrong extent coordinate order in moveend example

http://ol3js.org/en/master/examples/moveend.html

![1](https://f.cloud.github.com/assets/2715115/1417190/75bdb3de-3f7f-11e3-858b-ef9b08220cbe.jpg)
![2](https://f.cloud.github.com/assets/2715115/1417193/878bf5d0-3f7f-11e3-9004-bcf1bd4c0afd.jpg)