Changing CustomKernel _is_bool property to be bool as for all the other kernels rather than being Numpy bool.
Changing CustomKernel _is_bool property to be bool as for all the other kernels rather than being Numpy bool.

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