iOS 8 - CLLocationManager authorization

iOS8 introduced a new authorization scheme for Location data.
Before retrieving location data, CLLocationManager must request authorization.
Call two methods: requestAlwaysAuthorization/requestWhenInUseAuthorization
on a location manager (which one will work/preferred - can be adjusted
by setting NSLocationAlwaysUsageDescription/NSLocationWhenInUseUsageDescription
entries in a plist).

Task-number: QTBUG-41827
Change-Id: I9fc24921dc7d889b629b2c71e7698a33fc6ae47a
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>