Fix typo
[BUGFIX beta] Better error for content set on object
[DOC beta] Update filterBy docs to show that the value can be any type
[DOC beta] Clarified sort description

sort() is comparing comparator result being >0 or <0, it does not depend on strict 1 or -1. With original documentation people wanting to comply with specification they need to do if( a === b ) { return 0; } else { if( a > b ) { return -1; } else { return 1; } instead of simple subtraction.
Merge pull request #4096 from knownasilya/arraycontroller-not-array

[BUGFIX beta] Better error for object set on ArrayProxy
[beta] Use documentElement instead of body for ember-extension detection
Merge pull request #4397 from Kerrick/update-docs

Update filterBy docs to show that the value can be any type
Update CHANGELOG for 1.5.0-beta.2.
[BUGFIX beta] Use better ajax events for counters

Using `ajaxSend` and `ajaxComplete` instead of `ajaxStart` and
`ajaxStop`. See http://api.jquery.com/ajaxSend/ and
http://api.jquery.com/ajaxComplete/ for more information on each one.

It turns out that `ajaxStart` and `ajaxStop` are only called when the
request in question is the only one running. This is problematic for the
`wait()` helper. Changing to events that are called on _every_ request
fixes this problem.
[FEATURE ember-routing-add-model-option]

Adds `model` option for `route#render`

Feature flagged
Merge pull request #4293 from selva-G/add_model_option_route_render

[FEATURE ember-routing-add-model-option]
[DOC] Adds documentation to sorting order with Ember.computed.sort
[DOC beta] Ember.computed.sort: moving sorting options together
[FEATURE query-params-new] Normalize full name before trying to check in cache (fixes #4420).

We need to use a normalized version of `fullName` otherwise it will
return always the prototype.

The reason is that that keys are always normalized on the cache, we
end up querying for keys like 'controller:post.index' when it is stored
as 'controller.postsIndex'.
Merge pull request #4433 from abuiles/fix-query-params-controller-or-proto

Fix query params controllerOrProto (fixes #4420)
[DOC beta] Fixes type for `options` arg which should be Object and not String
Merge pull request #4438 from shahrukhomar/docs_fix

[DOC] Fixes type for the `options` arg on Application.register
[DOC beta] Add note about using `{{#with as}}`
[BUGFIX beta] PromiseProxyMixin reset isFulfilled and isRejected

Fixes #4414
Merge pull request #4445 from darkbaby123/promise-proxy-mixin-reset-promise

PromiseProxyMixin reset isFulfilled and isRejected