save on exit

local function saveGame()

_disk.saveTable( _gamedata, "SaveGameData.txt", system.DocumentsDirectory)
print ("  STUFF 'SAVED' to DISK ")
end

local function onSystemEvent ( event )

    print ( event.name .. ", " .. event.type )
    print ("getPrevious event type: " .. tostring (previousEvent))
    print ()

    if "applicationExit" == event.type then
        saveGame()
    end

    if "applicationReset" == event.type then
        saveGame()
    end
    previousEvent = event.type

    return true
end