Add sigma_clipped_stats test for masked array
Add sigma_clipped_stats test for masked array

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