make pickling tests work
make pickling tests work

aleksandr-bakanov/astropy,stargaser/astropy,astropy/astropy,pllim/astropy,astropy/astropy,StuartLittlefair/astropy,saimn/astropy,lpsinger/astropy,stargaser/astropy,MSeifert04/astropy,pllim/astropy,pllim/astropy,larrybradley/astropy,dhomeier/astropy,StuartLittlefair/astropy,dhomeier/astropy,astropy/astropy,stargaser/astropy,stargaser/astropy,StuartLittlefair/astropy,lpsinger/astropy,mhvk/astropy,MSeifert04/astropy,astropy/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,mhvk/astropy,saimn/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,saimn/astropy,mhvk/astropy,StuartLittlefair/astropy,larrybradley/astropy,dhomeier/astropy,larrybradley/astropy,pllim/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,lpsinger/astropy,lpsinger/astropy,pllim/astropy,astropy/astropy,mhvk/astropy,dhomeier/astropy,saimn/astropy,saimn/astropy,lpsinger/astropy,mhvk/astropy,MSeifert04/astropy,larrybradley/astropy