Tags on orders (Back-end), promotions

Orders haven been extended with an option to add tags. Order tags are really useful for situations where additional properties need to be set on an order which can be used for quick filtering and will be visible in the OMS 'Orders' list view. More information: Order tagging
Promotion product attribute functionality has now been released. The front-end configuration is currently in development. More information: Promotion attributes
Additional logging for Channable
General bugfixes and improvements