Support streaming updates in trapdoor via WebSockets

[jeffery9]

have add the draft of the message wall [ https://github.com/jeffery9/trapperkeeper/tree/wall ], it origin from tornado-redis-chat room.
i want the trapperkeeper can send the trap message into redis queue, and the websocket hanlder which is the same as trapdoor, it can sub to the message queue, and then update the wall page.
administrators can be informed by the kanban.
all the work just is a draft. i'm newbie of tornado and web client programming, i think that you guy implement this feature should more easy than me.

[gmjosack]

This is something we want but it's going to come through a larger overhaul of the web server. Right now this doesn't make sense to merge because I don't want to add the extra architectural overhead of requiring Redis for deployment. I'll keep this open to track automatic updates though.

[jeffery9]

@gmjosack i have a working prototype of the messaging wall, it can publish message to redis and subscribe it for websocket. but i wonder how to refresh the data form, if i reload the windows, the alert sound should been cancel, and bad user experience. thanks.