Fixed bug in Model2DKernel
Fixed bug in Model2DKernel

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