Extending Rails plugin new for nested engine support

Any word?

I personally think that this should be the responsibility of the engines, and nothing to do with Rails. Both Refinery and Spree (as examples that spring to mind) have different opinions on how to do this engines-that-extend-a-core-engine feature. I’m sure other things do too. I really don’t think that you could come up with a common way to implement this that would belong in core.