Remove outdated model documentation.
[BUGFIX release] Throws an assertion if `classNameBindings` are specified on a tag-less view

Fixes #9418
[BUGFIX release] attributeBinding on class triggers assertion.

Using `attributeBinding: ['class']` will render your view unable to
handle DOM events (`EventDispatcher` uses `.ember-view` class for
events), `classNameBindings` is the more appropriate place to do this.
[DOC release] Minor route template render doc change
[BUGFIX release] Remove 'use strict' for Ember.create usage in hotspots.

Conflicts:
	packages/ember-metal/lib/dependent_keys.js
[BUGFIX release] Fix htmlSafe to accept numbers

Handlebars SafeString does not ensure unescaped strings are actually
strings. Morph expects that they are.

Convert content to a string before passing it to SafeString.

Conflicts:
	packages/ember-handlebars/lib/views/handlebars_bound_view.js