dbus service : removing the method cloudeebus.Service.add
(to avoid the confusion with cloudeebus.BusConnection.addService)
dbus service : removing the method cloudeebus.BusConnection.removeService
(to avoid the confusion with cloudeebus.Service.remove)
switching all methods to 'Promise' interface
Removing alert() and using cloudeebus.log()
Rename method delAgent -> removeAgent
Merge pull request #25 from fpaut/agent_future

switching all methods to 'Promise' interface