correctOrderingOfAllAnnotations

added new ordering rules to RMMapView to show markers with label (selected) above markers without label (unselected). 

Tested in the Schiphol project wtih the iOS 6.1 Simulator

![ios simulator screen shot jun 28 2013 11 08 03 am](https://f.cloud.github.com/assets/1861794/720994/56085dd0-dfd2-11e2-8a10-3fb30a4cda31.png)
![ios simulator screen shot jun 28 2013 11 08 11 am](https://f.cloud.github.com/assets/1861794/720996/5880deac-dfd2-11e2-8386-f3355338687e.png)