Add SigmaClip examples
Add SigmaClip examples

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