Add a group "variable"

[N4th4]

With this, you can use %group% in the nickPrefix or in the nickSuffix. %group% will be replaced by the player's group.

[hef]

I appreciate the patch but:
I am trying very hard not to rely on external plugins directly.
For things like custom message formatting I am working with bukkit's service manager system to support feeding data into iChat.

[hef]

referencing http://forums.bukkit.org/threads/permissions-faq.25080/:

bukkit now has a built in permissions api. Dinnerbone recommends this method for prefixes.

For example, if you're trying to figure out which group should have which chat prefix, have a config file listing permission nodes -> prefixes. The server owner sets which node you should set on, and if someone has this node give them that prefix.

I plan on implementing this feature using the above method.