Add circles to map of cities with an open budget

### Change:
Adds circles to map for cities with an open budget.
closes #11 
### Screenshot:
![bildschirmfoto 2014-08-07 um 11 15 50](https://cloud.githubusercontent.com/assets/688980/3839632/816cd62e-1e13-11e4-8634-c4eff8de8793.png)