added code to app.js to enable the inspection of Ember Data in the Chrom...

Meant to fold this into the jshint warnings

I found a bit of code that makes the Chrome Ember Inspector plugin work with Ember Data when using Ember App Kit

![screen shot 2014-03-29 at 10 02 55 am](https://cloud.githubusercontent.com/assets/58883/2558474/369aad08-b74b-11e3-88b3-26863beec6df.png)