PARIS (Reuters) - German Chancellor Angela Merkel and French President Francois Hollande said on Thursday that it was crucial an upcoming European Union summit, the first since Britain voted to leave the bloc, addressed the EU's weaknesses with a plan for reforms. Britain's Brexit vote sent shockwaves through the European Unions long deemed by many voters to be overly bureaucratic and unresponsive to their concerns, while energizing the continent's anti-immigration, eurosceptic parties. "It is now about applying an agenda for Bratislava that makes clear we are determined to react together to the weaknesses, to the tasks we face," Merkel told...