Party now store OfflinePlayer instead of String
Fixed NPE due to null itemShareMode
Fixed /party invite trying to invite "invite"
Fixed NPE on /party invite when used without a second argument
Attempt to fix IOOBException due getOfflinePlayer at server startup
Fixed bad parties saving
Load parties before trying to do anything with them
Speeding up mcMMO startup a little
Fixed players not joining their parties at login
Fixed bad player names displaying when using /party