iOS: Correctly map to scene coordinates.

The views coordinates where not mapped to the scene.

Change-Id: Ide11bb8b9d54093c17988e79561839ebca9c3faf
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
iOS: emit progressChanged

Use the simplest possible implementation: 0% at
loadUrl and 100% at loadComplete.

Change-Id: Iefea52023df3d200e55dabde39b0a0217791e898
Reviewed-by: Christian Stromme <christian.stromme@digia.com>