moved the cursor into its own collection

bigbluebutton-html5/app/client/globals.coffee

bigbluebutton-html5/app/client/lib/bbb_api_bridge.coffee

bigbluebutton-html5/app/client/views/whiteboard/slide.coffee

bigbluebutton-html5/app/collections/collections.coffee

bigbluebutton-html5/app/lib/router.coffee

...ebutton-html5/app/server/collection_methods/cursor.coffee

...utton-html5/app/server/collection_methods/meetings.coffee

...-html5/app/server/collection_methods/presentations.coffee

bigbluebutton-html5/app/server/publish.coffee

bigbluebutton-html5/app/server/server.coffee