[DOC] Include `Ember.isEmpty({})` example

Coming from rails, I expected `Ember.isEmpty({})` to return `true`.
Since this isn't the case, it might be a good idea to illustrate this in
the docs, since there is already a unit test covering this case.
Moves `{{log}}` helper tests`
Merge pull request #9710 from twokul/log-helper-tests

Moves `{{log}}` helper tests`
Merge pull request #9709 from seanpdoyle/hash-is-empty

[DOC] Include `Ember.isEmpty({})` example
Moves escaping tests
Merge pull request #9711 from twokul/escape-integration-tests

Moves escaping tests
More tests for `{{with}}` and `{{view}}` integration
Merge pull request #9712 from twokul/more-with-view-integration

More tests for `{{with}}` and `{{view}}` integration
Deletes commented tests
Merge pull request #9714 from twokul/uncomment-tests

Deletes commented tests
Moves `{{bind}}` helper tests
Merge pull request #9713 from twokul/with-bind-tests

Moves `{{bind}}` helper tests
Moves tests for text field
Tweaks for text-area tests
Removing duplicate tests

See
[here](https://github.com/emberjs/ember.js/blob/master/packages/ember-views/tests/views/view/template_test.js#L21-57)
Merge pull request #9719 from twokul/text-field-integration

Moves tests for text field
Merge pull request #9726 from twokul/text-area-tests

Tweaks for text-area tests
Merge pull request #9727 from twokul/template-tests

Removing duplicate tests
Moves `{{each}}` tests
Use ember-htmlbars/system/compile