Changed special timestamp '0' to '-1'
Changed special timestamp '0' to '-1'

criteo-forks/carbon,graphite-project/carbon,benburry/carbon,graphite-server/carbon,krux/carbon,kharandziuk/carbon,xadjmerripen/carbon,JeanFred/carbon,protochron/carbon,graphite-project/carbon,piotr1212/carbon,lyft/carbon,pu239ppy/carbon,johnseekins/carbon,JeanFred/carbon,kharandziuk/carbon,pratX/carbon,piotr1212/carbon,deniszh/carbon,iain-buclaw-sociomantic/carbon,protochron/carbon,cbowman0/carbon,deniszh/carbon,xadjmerripen/carbon,krux/carbon,pu239ppy/carbon,mleinart/carbon,benburry/carbon,johnseekins/carbon,pratX/carbon,graphite-server/carbon,criteo-forks/carbon,obfuscurity/carbon,obfuscurity/carbon,mleinart/carbon,lyft/carbon,cbowman0/carbon,iain-buclaw-sociomantic/carbon