Skip block_reduce doctest for scikit-image dependency
Skip block_reduce doctest for scikit-image dependency

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