Emit Snapshot creation events

[sminnee]

As a developer, I'd be keen on responding when information is changed in the system. For example, if I want to build a notifications module that lets me send an email when a record is created, I'd rather just listed on 'new record created' rather than all the applicable 'form submitted' events.

I'd like some code that links to the right forms, and triggers appropriate events on change data in a way that's not too granular.

This module has a bunch of logic to do this, and writes the result as a snapshot. As such, listening to the "snapshot created" event would be a simple way for me to build my notifications module.