added support for doing data downloads even in absense of cache directory access
added support for doing data downloads even in absense of cache directory access

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