[TIMOB-17665] iOS8: userLocation is not displayed when using ti.map module

Added checks for the 2 new iOS8 CLAuthorizationStatus kCLAuthorizationStatusAuthorizedWhenInUse & kCLAuthorizationStatusAuthorizedWhenInUse so that if in tiapp.xml NSLocationWhenInUseUsageDescription only is included the users location will be shown on the map when userLocation is set to true.

See the Apple Doc: 
https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLLocationManager_Class/index.html#//apple_ref/c/tdef/kCLAuthorizationStatusAuthorized

https://jira.appcelerator.org/browse/TIMOB-17665