ensure that the differentials are dropped when transform is called on a representation
ensure that the differentials are dropped when transform is called on a representation

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