BugFix-#184: The unread notification currently counts the user joined and left messages, we should skip them.

Removed self-mention buf on channel join.

Removed unread log count for user ChannelJoin, ChannelPart and
QUITIRC events
Merge pull request #187 from Ghost-script/BugFix-#184

BugFix-#184: The unread notification currently counts the user joined and left messages, we should skip them.