Map navigation

Add zoom to extend to map navigation
Add search to map navigation
## Screenshot
![bildschirmfoto 2014-10-27 um 09 16 55](https://cloud.githubusercontent.com/assets/688980/4787865/c49e9bd4-5db1-11e4-9c26-31320ec0517b.png)
![bildschirmfoto 2014-10-27 um 09 17 03](https://cloud.githubusercontent.com/assets/688980/4787866/c73d8044-5db1-11e4-9653-1f61e761f11a.png)