bugfix in read_class - same bug, this time used update right
bugfix in read_class - same bug, this time used update right

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