Added alias for /mb
Fixed unban NPE syncer
Added RangeBans:
/rangeban <IP1-IP2> [reason] [-s]
/unrangeban <IP> [-s]

Added whitelist so a user can join from an IP address which is banned...
usage:
/whitelist <user> //Toggles whitelist on/off for the user

Added ListenerSkeleton class
Log IP addresses immediately now, regardless of whether they're banned
or not.

Checkban command now extends CmdSkeleton