Bukkit

v1.2

Add TabComplete: /nick [TAB] -> list of display names except one's display name (without color)
Bugfix: Previous nicknames stay in the hashmap...

v1.1

Bugfix: \nick do not removed nickname
Add: \nick <a used nickname> tells who is using the nickname

v1.0

Deny duplicate nickname

Deny nicknames that equal a player name logged:
- Deny when a player wants to set a nickname which is another logged player's name (colored or not)
- Remove a player nickname (in nick.yml) when a player with the same name logs in

Rem: the comparison between nicknames uses nicknames without color codes

###v1.2
If `A B C D` is a nickname, `/nick A B[TAB][TAB]` will do `/nick A B C B C D` because of some completion mechanisms of minecraft chat. I have no idea how to correct it without removing spaced nicknames