add func_deriv to custom_1d_model
add func_deriv to custom_1d_model

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