Bukkit

Fixed errors in config migration

Updated to the latest API version

Extended parsing of game mode names: only the minimum amount of characters to uniquely identify a game mode is needed. That means "c" is interpreted as "creative", "a" is "adventure", but "s" is not unique since both "spectator" and "survival" begin with "s". Therefore, you need one character more: "su" is "survival", "sp" is "spectator".