Fix sort_listing for Ruby1.8
Fix sort_listing for Ruby1.8

thomthom/yard,travis-repos/yard,ohai/yard,jreinert/yard,thomthom/yard,alexdowad/yard,lsegal/yard,jreinert/yard,ohai/yard,herosky/yard,iankronquist/yard,alexdowad/yard,lsegal/yard,travis-repos/yard,lsegal/yard,thomthom/yard,alexdowad/yard,amclain/yard,iankronquist/yard,amclain/yard,herosky/yard,iankronquist/yard,amclain/yard,jreinert/yard,ohai/yard,herosky/yard