** Added sessionOpen event to be fired after succesful join request into
api.js
** Added support for "sessionEvents" extension (sends session open /
close patches to clients)
** Fixed bug in rest.js that caused all session to be created as
anonymous
** Added initial draft of coops-sessionevents CKEditor plugin (can be
used to listen session events extensions and to fire CollaboratorJoined
/ CollaboratorLeft events
** Added sessionId property into CollaboratorJoined and CollaboratorLeft
events in coops-sessionevents CKEditor plugin
** Added removeCollaborator mehtod into collaborators js widget
** Changed api remove session on sessionClose
** Changed existing session to be removed on application start
** Added sessionevents into editdoc.js
** Added script to add display collaborators in editdoc.js
** Rolled back session removal as a bad idea
** Added new collection 'filesessions' into database
** Changed api to resolve active file sessions from filesessions db
collection
** Added session events extension into api join request
** Changed all existing file sessions to be removed on application start
** Changed sessionsevents CKEditor plugin to fire initial session event
data on session start