Use JSON for Fumi protocol.
login protocol partialy implemented.
more on login protocol.
clean up line style handling.
multi canvas handling. tentative checkin.
login/logout handling server side done
Multi usre handling. Tentative check in.
multi user support. partialy done. buggy.
handle message of the users who logged in beforehand.
reclame canvas id on disconnect.
Merge branch 'development'