added array shape test for biweight_midcovariance
added array shape test for biweight_midcovariance

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