a joining user is displayed in the user list
 - display message to user when auth token is invalid
 - make sure create, register user and validate are in correct sequence
 - start implementing lock settings
fix indents
get_users_request + reply ... the array of users is empty for now, I wonder if it will contain users if my user is not the only one in the meeting
 - send lock settings from server to client
 - require only meetingid and userid for join_user message
 - send new lock settings to server
work on user_joined_event prior to get_users_request
Merge branch 'implement-lock-settings' of https://github.com/bigbluebutton/bigbluebutton into merge-polling-with-master
displays the users in the UI userlist