Add known issue that overflowing ints get cast to float in ascii.read for numpy 1.5
Add known issue that overflowing ints get cast to float in ascii.read for numpy 1.5

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