GAINESVILLE, Fla. — The Georgia Southern Eagles are the most storied program in the history of the Football Championship Subdivision. They’ve won six national titles, an eye-popping 45 playoff games and a handful of memorable regular-season upsets.Saturday in Gainesville, Fla., the Eagles’ disappointing 2013 season turned into a storybook ending. They beat the Florida Gators 26-20, signaling the end of the FCS era and the beginning of a whole new chapter.Georgia Southern, which will join the Football Bowl Subdivision Sun Belt Conference in 2013, said, “Hey!