fixed format_exception to not fail in py 3.x
fixed format_exception to not fail in py 3.x

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