(REUTERS)  Bill and Hillary Clinton’s charitable foundation hired the security firm FireEye to examine its data systems after seeing indications they might have been hacked, according to two sources familiar with the matter. So far, no message or document clearly hacked from the New York-based Clinton Foundation has surfaced in public, the sources said. One of the sources and two U.S. security officials said that like hackers who targeted the Democratic National Committee, Hillary […]