title: allowsBackgroundLocationUpdates in CLLocationManager in iOS9
body: <p>I'm using <code>CoreLocation</code> framework in my app in Xcode7(pre-released),and I noticed that there is a newly added property called <code>allowsBackgroundLocationUpdates</code> in <code>CLLocationManager</code> class.</p>
  
  <p>What's the relationship between this property and the location updates in the Background Modes of the Capabilities tab. What's the default value of it and does it affect apps running in iOS9?</p>