[CHANGE] Using bukkit way to see if it's the first time for the player.
[CHANGE] Better way to load the world, should resolve some issue. See
#399
[MAJOR FIX] Major NPE fix. See #402
[DEBUG] adding debug log.
[FIX] Reflection on MoveToWorld that have a new parameter.
[FIX] Conversion failure on world not loaded for lastLocation.
[FIX] If there is a MappingNode that is corrumpted (like a home) because
of unwanted recursion, remove it and construct it as an empty map. See
#401