use native request Location method
use native request Location method

As in
```
function enableLocationRequest(always) {
if (Number(platformModule.device.osVersion) >= 8.0) {
var iosLocationManager = CLLocationManager.alloc().init();
if (always) {
iosLocationManager.requestAlwaysAuthorization();
}
else {
iosLocationManager.requestWhenInUseAuthorization();
}
}
}
```

platformModule.device.osVersion giving NAN hence we have to directly use
native way to request access

fyhao/tns-webform-client,fyhao/tns-webform-client