export the message records

[RityZhang]

Able to export the message records in txt format to computer.

[jmangel]

This would be great for the client interface. It is worth discussing whether this will be available on the server as well; users may expect privacy and not want someone behind the server to be able to save private chats, while the server may need to keep track of conversation for logs. Interesting topic in the "real world" of software design as well

[jmangel]

F16 OK (100 pts)

[seemantasaha]

Only authorized user should be able to download chat messages in a text format. It would be better to make the file password protected.

W18 OK. 200 points.