* Adds a method to consumables to check if a notification should be sent
Adds the checkin_email method to Consumables, this gets checked in notifications when checking out the consumable.
Without the method, no notifications get sent for checking out consumables.
* Fixes the checkin_email method on the License model
This should allow the License to also send checkout/checkin notifications again.
Till Deeke
b6e3715cd8