Changing xrange to six.range for PY3 compatibility
Changing xrange to six.range for PY3 compatibility

DougBurke/astropy,dhomeier/astropy,pllim/astropy,joergdietrich/astropy,mhvk/astropy,dhomeier/astropy,pllim/astropy,dhomeier/astropy,astropy/astropy,pllim/astropy,saimn/astropy,StuartLittlefair/astropy,larrybradley/astropy,StuartLittlefair/astropy,kelle/astropy,tbabej/astropy,tbabej/astropy,dhomeier/astropy,funbaker/astropy,saimn/astropy,lpsinger/astropy,StuartLittlefair/astropy,AustereCuriosity/astropy,MSeifert04/astropy,funbaker/astropy,MSeifert04/astropy,kelle/astropy,larrybradley/astropy,bsipocz/astropy,AustereCuriosity/astropy,pllim/astropy,aleksandr-bakanov/astropy,astropy/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,astropy/astropy,mhvk/astropy,larrybradley/astropy,lpsinger/astropy,saimn/astropy,tbabej/astropy,kelle/astropy,StuartLittlefair/astropy,lpsinger/astropy,joergdietrich/astropy,kelle/astropy,bsipocz/astropy,DougBurke/astropy,larrybradley/astropy,saimn/astropy,mhvk/astropy,stargaser/astropy,lpsinger/astropy,StuartLittlefair/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,astropy/astropy,tbabej/astropy,stargaser/astropy,tbabej/astropy,larrybradley/astropy,joergdietrich/astropy,bsipocz/astropy,DougBurke/astropy,lpsinger/astropy,DougBurke/astropy,joergdietrich/astropy,AustereCuriosity/astropy,pllim/astropy,stargaser/astropy,stargaser/astropy,dhomeier/astropy,AustereCuriosity/astropy,bsipocz/astropy,mhvk/astropy,AustereCuriosity/astropy,mhvk/astropy,joergdietrich/astropy,MSeifert04/astropy,funbaker/astropy,kelle/astropy,funbaker/astropy,astropy/astropy,saimn/astropy