Move ranging into didDetermineSate

RangeWhileMonitorPart04.swift

    func locationManager(manager: CLLocationManager!, didDetermineState state: CLRegionState, forRegion region: CLRegion!) {
        if let region = region as? CLBeaconRegion {
            switch state {
            case .Inside:
                manager.startRangingBeaconsInRegion(region)
            case .Outside:
                manager.stopRangingBeaconsInRegion(region)
            case .Unknown:
                break
            }
        }
    }