Add --resize-to-root option, sets ResizeViewToRootObject on the qmlscene view.

Sometimes it is useful to be able to resize a view from within QML, for example,
when writing QML which must operate in both portrait and landscape conditions.

Change-Id: I10564bb3c8661fae6c1d175985268a409dc3dafd
Reviewed-by: Alan Alpert <alan.alpert@nokia.com>