FinanceHess receives shareholder approval for Chevron mergerFuture of merger still in the air over Guyana tiff with ExxonMobil and CNOOC InternationalHess chief executive John Hess appears on CNBC to speak about Chevron's deal to buy Hess for $53 billion all-stock deal.Photo: REUTERS/SCANPIXRobert StewartNorth America Energy CorrespondentBaton Rouge