Add changes-5.1.1 file

Change-Id: I03dbfd3adae98d270205d340683f130fec1e3784
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: Ie8125e55d25a0a3d1ada3641398c31993a573107