Bump MODULE_VERSION to 5.3.1

Change-Id: Ic647a5bb39de64d02fb5d98cbda8c7f398ce8f1e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Conflicts:
	.qmake.conf

Change-Id: I5a75f8070bf8e0c4fb52ee8eabecba2fa75b5f1f