Rename QtMacExtras_{master,dev}_Integration project

Switching to use the dev/stable/release scheme in the future.

Change-Id: I2fecc34d3e9f4093b638ec9919859a7071afcfe0
Reviewed-by: Liang Qi <liang.qi@digia.com>
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Simo Fält <simo.falt@digia.com>