Allow to debug the Ember Inspector in the browser.

Run `grunt development` and point your browser to `http://localhost:9292`.

You can now debug the Ember Inspector with the Ember Inspector !

![ember-inspector debug](https://cloud.githubusercontent.com/assets/743977/3680555/bb75eb9a-12af-11e4-8221-703f30d636b7.png)

There are still some issues, but before spending more time on this, I'd like to get some feedback.