BUG: add a dir in SVN for the git svn commit from kevin wang

Kevin is adding a scalar bar actor with extra features, it
will go in the VTKRendering subdir

Issue #2919



git-svn-id: http://svn.slicer.org/Slicer4/trunk@21833 3bd1e089-480b-0410-8dfb-8563597acbee