add simple test case against numpy.convolve
add simple test case against numpy.convolve

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