Added test script which runs all the demos in the OSG to make sure they run ok.  User has to verify they are correct visually.
Added test script which runs all the demos in the OSG to make sure they
run ok.  User has to verify they are correct visually.


ghub/osg,ntoand/osg,stmh/osg,artoolkit/osg,stmh/osg,stmh/osg,omega-hub/osg,artoolkit/osg,omega-hub/osg,stmh/osg,koshman86/osg,XiaoCC/osg,XiaoCC/osg,ghub/osg,XiaoCC/osg,XiaoCC/osg,ghub/osg,XiaoCC/osg,koshman86/osg,ntoand/osg,ntoand/osg,koshman86/osg,ntoand/osg,omega-hub/osg,stmh/osg,omega-hub/osg,koshman86/osg,artoolkit/osg,ghub/osg,artoolkit/osg