Install all sphinx dependencies, and test old Numpy versions only with Python 2.7
Install all sphinx dependencies, and test old Numpy versions only with Python 2.7

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