fix conditionals in DayTimeDuration::stringValue()

Task-number: QTBUG-35479
Change-Id: If385bd85f5c20871a0248c828626deea2d72e0a2
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Peter Hartmann <phartmann@blackberry.com>
Minor optimization, use QStringRef over QString

That way we avoid some unnecessary memory allocations

Change-Id: I597443393671d57b1a47b37eb15c3eca54ee4168
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Bump MODULE_VERSION to 5.2.2

Change-Id: Ibf702ab35725578d4f72f4959b1bcca9d8332ce0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Merge remote-tracking branch 'origin/stable' into dev

Conflicts:
	.qmake.conf

Change-Id: I8a745d75ab994164aa861f5d5082e493b02eaea4