Use local npm packages for defeatureify.

Update to the latest `ember-dev` which requires `defeatureify` and
`yuidocjs` to be installed locally (previously these were required to be
global).

Also, adds a `package.json` to make installing as simple as `npm install`.
[DOC release] Fix template lookup documentation.

The previous documentation suggested that an `Ember.View` could specify
its `templates` property to be used for template lookup instead of using
`Ember.TEMPLATES`.

This fixes the documentation to reflect what we are actually doing for
template lookup.
Merge pull request #3675 from rjackson/use_local_modules

Use local npm packages for defeatureify.
Merge pull request #3648 from rjackson/split_ember_view_core_up

[DOC release] Fix template lookup documentation.