minor cleanup
minor cleanup

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