Add 'created' webhooks

[wcurtis]

There's no native customer_create_after event in magento so we'll have to use the customer_save_after and check if the object is new or not.

[wcurtis]

I gave this a shot this evening but unfortunately the isObjectNew() function is always false in the save_after events. Will have to find another way :/

[kandy]

Use plugin instead of events. For example if you intercept ResourceModel::save method you can access to object->getId() method to know is it create or update event.