QUnit testing

This adds a QUnit based test runner.

For more information about QUnit, see http://qunitjs.com/.

For more information about integration testing in ember, see http://emberjs.com/guides/testing/integration/.

To use this, run `grunt server` as normal and append `?test=true` to the url.

Then write your tests in the `project/source/tests/` files.

![screen shot 2014-02-27 at 11 15 07 am](https://f.cloud.github.com/assets/643885/2286579/7de27616-9fe3-11e3-8ab9-c9936cc0afaa.png)

![screen shot 2014-02-27 at 11 15 50 am](https://f.cloud.github.com/assets/643885/2286592/96514a38-9fe3-11e3-9540-040266f0ca36.png)