Add Qt4Project::proParsingDone(), which is emitted after parsing

Change-Id: Id2eb1d2494438bac17f3104ee8a9ed56cc9b1db9
Task-Nr: QTCREATORBUG-6056
Reviewed-on: http://codereview.qt-project.org/4665


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>