Android 5.0: apply tint color

Without this change checkboxes, radio buttons, slider handle etc.
are black on Android 5.0. This change applies the tint color so
that the controls become green/cyan as appropriate.

Task-number: QTBUG-42520
Change-Id: Ib8bd9d279f34e0f7951b311f398bc1fb11f7b1ba
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
Doc: Update gallery screenshots

To match the updated example. Display a screenshot for both
Android and OS X in the gallery example documentation.

Change-Id: I37e56437bb54248a4d500810c56ce8a8ba15b4d2
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Martin Smith <martin.smith@digia.com>