bump version to 2.5.1
bump version to 2.5.1

zigurana/EmulationStation,jrassa/EmulationStation,joolswills/EmulationStation,joolswills/EmulationStation,jrassa/EmulationStation,zigurana/EmulationStation,zigurana/EmulationStation,jrassa/EmulationStation,joolswills/EmulationStation,joolswills/EmulationStation,jrassa/EmulationStation