[DOC release] Cleanup application API code examples

Quotes, vars, spaces
[BUGFIX beta] Assert existence of `name` property for registered initializers
Use ember-dev test helpers.

* Move configuration, into `index.html`.  This is in preparation for
  publishing the test runner page to S3 (so users can hit
  `http://builds.emberjs.com/canary/ember-test.html`).
* Use updated helpers from ember-dev.
Publish test index.html for easier testing from S3.