CenterMapOnLocatiom

/* Set up and load map. Add user annotation pin to map. */
    private func centerMapOnLocation(location: CLLocation) {
        ratingLocationMap.delegate = self

        let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, 100, 100)
        ratingLocationMap.setRegion(coordinateRegion, animated: true)

        let userLocation = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)

        userAnnotation = MapAnnotation(name: "You are here",  distanceKM: nil, pinImageValue: "userPin", coordinate: userLocation)

        ratingLocationMap.addAnnotation(userAnnotation)
    }   // centerMapOnLocation()