switch back to latest stable sphinx
switch back to latest stable sphinx

larrybradley/astropy-helpers,bsipocz/astropy-helpers,bsipocz/astropy-helpers,Cadair/astropy-helpers,larrybradley/astropy-helpers,Cadair/astropy-helpers,bsipocz/astropy-helpers,dpshelio/astropy-helpers,larrybradley/astropy-helpers,astropy/astropy-helpers,dpshelio/astropy-helpers,astropy/astropy-helpers