Mapview delegate must be set earlier on iOS6
In iOS 5 and earlier, you could set your mapview delegate after annotations had been added to the map and be assured that mapView:viewForAnnotation: would be called for all annotations.
On iOS 6, setting the delegate too late means that annotations already added to the map will get a default annotation view, and the custom mapView:viewForAnnotation will not be called.
This results in pins with callouts with (for example) no accessory views.
Steps to Reproduce:
Add annotations to the map. Set the delegate later in the code. Check that mapView:viewForAnnotation has been called.
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