[DOC] Correction for `ActionHandler` implementing classes
Require ember-testing if present.

This ensures that the globals are setup properly if `ember-testing` is
present in the build.
Merge pull request #4515 from rjackson/enable-ember-testing-if-present

Require ember-testing if present.
fixed run.bind to keep the arguments from the callback.
[DOC beta] Fix `method` tag for `makeViewHelper` doc
The API docs were incorrect (and private) for `helper` because
it was being overridden here.
Now both `helper` and `makeViewHelper` will appear correctly.
Merge pull request #4525 from bradfol/doc-handlebars-helper

[DOC beta] Fix `method` tag for `makeViewHelper` doc
[FEATURE ember-metal-computed-empty-array] Enable by default.
[FEATURE ember-runtime-test-friendly-promises] Enable by default.
[BUGFIX] Add `which` attribute to event triggered by test helper
Do not override local scope with imported Ember.run in Ember.Test.
Merge pull request #4530 from rjackson/fix-issue-with-es6ing-ember-testing

Do not override local scope with imported Ember.run in Ember.Test.
[DOC] minor doc fix
Merge pull request #4531 from twokul/minor-doc-fix

[DOC] minor doc fix
fix run.bind tests
fixed variable name
removed unnecessary obj and value since all we need is to check the arguments
fixed function instead of var syntax error
fixed forgotten target
fix doc typo
Merge pull request #4539 from denisnazarov/patch-3

fix doc typo