Fix format statement that is incompatible with Python 2.6
Fix format statement that is incompatible with Python 2.6

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