emberjs/ember.js — pull request #3992 by trek (2013-12-24 13:55:01+00:00)
Title: Remove ember-states removal message

It's been several releases since we put the message. I imagine anyone who
needed to see it has seen it and brought ember-states into their application
on their own.

Now, it's just confusing to people who are new to the framework:
https://twitter.com/wildfalcon/status/415452513723498496