remove redundant assignment of isDestroyed
[DOC] Add missing link to handlebars.helpers.input in Ember.Checkbox.
Revert "Docs: Fix link in handlebars text field API"

This reverts commit c9be7cf1b968286dd507736076ff70219ad7ddee.
Remove feature flags for 'ember-routing-didTransition-hook'.
Remove feature flags for 'ember-routing-loading-error-substates'.
Remove feature flags for 'ember-runtime-sortBy'.
Remove feature flags for 'container-renderables'.
Remove feature flags for 'link-to-non-block'.
Remove feature flags for 'reduceComputedSelf'.
Components are lazily looked up.
Fix incorect removal of 'ember-routing-loading-error-substates'.
[FEATURE ember-testing-routing-helpers]

Adds `currentRouteName`, `currentPath`, and `currentURL` testing helpers.
Merge pull request #3711 from rjackson/add_route_testing_helpers

[FEATURE ember-testing-routing-helpers]
Merge pull request #3787 from rjackson/remove_stable_feature_flags

Remove feature flags that are included in 1.2.0.
Merge pull request #3764 from abuiles/add_link_to_handlebars_checkbox

[DOC] Add missing link to handlebars.helpers.input in Ember.Checkbox.
Ember.Object.create now takes `undefined` as an argument.

Fixes #3701.
Merge pull request #3782 from twokul/ember-object-create-undefined

Ember.Object.create now takes `undefined` as an argument.
[FEATURE ember-testing-triggerEvent-helper]

Adds `triggerEvent` testing helper to allow triggering of arbitrary
events on an element.
Merge pull request #3792 from rjackson/trigger_test_helper

[FEATURE ember-testing-triggerEvent-helper]
Merge pull request #3480 from Lowest0ne/remove-redundant-assignment

remove redundant assignment of isDestroyed