added logo in sphinx dir
added logo in sphinx dir

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