add sphinx-gallery to extension list
add sphinx-gallery to extension list

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