changed cache directory name to "download" to reflect wider scope
changed cache directory name to "download" to reflect wider scope

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