remove rewatch
Extract if/unless/with/bind-attr into their own modules
Merge pull request #9390 from mmun/refactor-binding.js

Extract if/unless/with/bind-attr into their own modules
Add a test for a bug fixed on beta
[BUGFIX beta] Fix bound helper argument types

Fix SimpleHandlebarsView.prototype.normalizedValue's handling of null
and undefined cases (#9280).

The issue was introduced by this commit (handlebars_bound_view.js):
https://github.com/emberjs/ember.js/compare/b9e6166...b87696b#diff-3

Conflicts:
	packages/ember-handlebars/lib/views/handlebars_bound_view.js
	packages/ember-handlebars/tests/helpers/bound_helper_test.js
Allow more configurability in production builds.

```
DISABLE_ES3=true DISABLE_JSHINT=true DISABLE_MIN=true ember serve --environment=production
```

Takes initial production build time from 70s to 21s, and rebuilds from
6s to 2s.
Merge pull request #9391 from rwjblue/more-configurability-for-prod-builds

Allow more configurability in production builds.
[FEATURE ember-testing-pause-test] Add a helper to pause a test
Remove check for ember-testing-route-helpers feature flag in tests
* Feature flag is not referenced anywhere else
Merge pull request #9393 from kategengler/remove-unused-feature-flag-in-tests

Remove check for ember-testing-route-helpers feature flag in tests, it appears unused
[BUGFIX beta] Make mandatory setter more helpful.
Merge pull request #9383 from kategengler/never-ending-promise

Add pauseTest test helper
Merge pull request #9392 from rwjblue/improve-mandatory-setter-assertion

[BUGFIX beta] Make mandatory setter more helpful.
[BUGFIX beta] Bump HTMLBars to fix IE9 issues
[BUGFIX beta] Assert state of DOM for property changes instead of using jQuery
Remove code-climate complains
Merge pull request #9396 from mixonic/ie9

[BUGFIX beta] IE9 Fixes
Merge pull request #9397 from cibernox/clean_brocfile

Remove code-climate complains in brocfile
Raise an error when attempting to merge an Array from mergedProperties
Make blockHelperMissing a no-op

In Handlebars 2.0, blockHelperMissing is only used for Mustache compatibility.