fixes to open_from_hdu
fixes to open_from_hdu

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