Added extensions code submitted by Yefrei.
Added extensions code submitted by Yefrei.


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