added link to grid repo
added link to grid repo

e-koch/pyspeckit,jpinedaf/pyspeckit,pyspeckit/pyspeckit,keflavich/pyspeckit,bsipocz/pyspeckit,allisony/pyspeckit,mikelum/pyspeckit,keflavich/pyspeckit,low-sky/pyspeckit,dinossimpson/pyspeckit,pyspeckit/pyspeckit,allisony/pyspeckit,vlas-sokolov/pyspeckit,e-koch/pyspeckit,dinossimpson/pyspeckit,low-sky/pyspeckit,vlas-sokolov/pyspeckit,bsipocz/pyspeckit,jpinedaf/pyspeckit,mikelum/pyspeckit