Bukkit

- No longer does checks on login
- Checks one semi-random player (randomizes when a new player logs in so it doesn't have to store and check what players have and have not been checked yet) every 5 minutes to 5 seconds depending on how many players are online
- Hopefully fixed GroupManger support (needs further testing)
- Added the option for overriding vault and doing custom commands (possibly fixes PermissionsBukkit support but still untested)