* bus, calendar
This commit changes the notification API and adapts codes that use it
Notification API before:
- create(...): number
- close(id: number, wait?: number)
Notification API now:
- add(...): RemoveCallback
closes odoo-dev/odoo#908
Related: odoo-dev/enterprise#158
Signed-off-by: Géry Debongnie (ged) <ged@openerp.com>