Add SigmaClip test
Add SigmaClip test

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