introducing Chat collection, clear on start, publish, subscribe, etc
inserting the chat messages we receive from bbb-apps into the Chat collection
when we press Enter, the chat message enters the collection
when we try to send a chat message from the html5 client we now send a send_public_chat_message_request towards bbb-apps
implemented listeners for send_public_chat_message_request and send_private_chat_message_request
sending on the chat channel
adjusting the parameter names so that they match what is recognized on the server
fix user logout