Allow disabling updates when the display is off
Merge pull request #66 from Vesuri/master

Allow disabling updates when the display is off
Redraw all QQuickWindows then display updates are enabled
Merge pull request #68 from Vesuri/master

Redraw all QQuickWindows then display updates are enabled
Bump version
Expose screen orientation as a property
Merge pull request #70 from Vesuri/master

Expose screen orientation as a property
Change semantics of surface mapped and unmapped

If a window is hidden (setVisible(false) / hide()), do not remove
it from the model. Only when surface gets destroyed
(on QWindow::close()), remove from window model.
Bump the QQuickWindow revision of the LipstickCompositor
Emit windowHidden signal when a surface is unmapped