fix log.warning -> log.warn when using distutils warn
fix log.warning -> log.warn when using distutils warn

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