Bind / Bubble Events for Nested SubModels

[aubricus]

I'd like to listen to change event's from any nested model on my top-level relational model. I've been searching through the documentation and cannot find a method to do this.

I did find this issue from three years ago: #56

Was there any update to that utility function you sketched out at the end of the ticket? I've tested the function from #56 and it does work but only for the first level of nested models. It will suffice for now. But if there's been something similar added to the source I'd rather use that.

Any thoughts? Thanks!