Make Ember.Namespace#toString ember-cli aware
Test for Ember.Namespace#toString ember-cli awareness
Merge pull request #9271 from jayphelps/patch-3

Make Ember.Namespace#toString ember-cli aware
Clarify {{action}}s use a quick way to add _one_ event to an element.

Direct readers to Component for more robust event handling.
Merge pull request #9274 from trek/document-single-use-of-action

Clarify {{action}}s use a quick way to add _one_ event to an element.
Deprecate before observers