Root element auto-add ordering

[slindberg]

In situations where the the #ember-testing root element is not already in the testing document and the first test uses moduleForComponent, tests fail with the error:

Setup failed on root element is auto-added before moduleFor callback: Assertion Failed: Unable to add "ember-application" class to rootElement. Make sure you set rootElement to the body or an element in the body.

This is because the callback that moduleForComponent provides to moduleFor expects the root element to exist already (by calling setup on an event dispatcher).

This also fixes a failing deprecation test because of newer deprecations in 1.7.0.

[rwjblue]

Thank you!