Added overload to join multiple chat channels.
Now attemping to parse unknown commands in the default format; Renamed RawMessageParts enum values.
421 command is now "421" instead of "INVALID"; Channel name and target name have been switched.
353 command is now "353" instead of "NAMES".
Channel names are message targets.
Now parses 366 end of names comand.
353 now contains messae source.
Merge branch 'master' of https://github.com/tphx/StreamChatSharp.git