Message type definitions

[jybaek]

Separate user's normal message and operational messages.

e.g.)

• normal message => msg.type = 'user' ( default )
• operational message => msg.type = 'admin'

This gives us more freedom to control our chat rooms.

how about this ?

[jybaek]

system message

• msg.type = 'system'
• e.g.) +/- sub, join, leave, ...

user message

• msg.type = 'user'
• e.g.) chat message

admin message

• msg.type = 'admin'
• e.g.) exit, ...