Add sigmaclip test for return_bounds
Add sigmaclip test for return_bounds

mhvk/astropy,astropy/astropy,mhvk/astropy,pllim/astropy,larrybradley/astropy,saimn/astropy,StuartLittlefair/astropy,saimn/astropy,saimn/astropy,lpsinger/astropy,pllim/astropy,saimn/astropy,mhvk/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,lpsinger/astropy,StuartLittlefair/astropy,astropy/astropy,StuartLittlefair/astropy,pllim/astropy,mhvk/astropy,larrybradley/astropy,StuartLittlefair/astropy,larrybradley/astropy,lpsinger/astropy,StuartLittlefair/astropy,lpsinger/astropy,pllim/astropy,astropy/astropy,astropy/astropy,larrybradley/astropy,larrybradley/astropy,saimn/astropy,astropy/astropy