colorize irc notification.

## Weechat

### before
![](http://blog.glidenote.com/images/2013/10/before_weechat.png)

### after
![](http://blog.glidenote.com/images/2013/10/after_weechat.png)

## Limechat

### before
![](http://blog.glidenote.com/images/2013/10/before_limechat.png)

### after
![](http://blog.glidenote.com/images/2013/10/after_limechat.png)