Add changes-5.1.1 file

Change-Id: I7254379bc54c5aa562fd13b44f66d245244c4d6a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: I4ad3ca66f63476974bdfcadcff373179715a34d2