- setup whiteboard model so that display will query it during redraws

...button/modules/whiteboard/WhiteboardCanvasDisplayModel.as

...bigbluebutton/modules/whiteboard/WhiteboardCanvasModel.as

...uebutton/modules/whiteboard/managers/WhiteboardManager.as

...luebutton/modules/whiteboard/maps/WhiteboardEventMap.mxml

...t/src/org/bigbluebutton/modules/whiteboard/models/Page.as

...g/bigbluebutton/modules/whiteboard/models/Presentation.as

...igbluebutton/modules/whiteboard/models/WhiteboardModel.as

...bluebutton/modules/whiteboard/services/MessageReceiver.as