Finish off bans.

- /gban <name> <reason>
- /gunban <name>
- /gbanreason <reason>
- /gbanlist
Finish off bans/mutes/add server list.

* ignore case on bans/mutes
* add gmute/gunmute/gmutelist commands
* add slist command (with sliest <server> option)
Merge pull request #3 from mortu/master

Added more commands/finished off existing ones.