App version in Ember console debug statements

Just started using this in our app, so thanks :smile:

Since the addon defines an initializer that registers the app as an ember library, I was surprised to see that it wasn't listed in the normal [library version debug output](https://github.com/emberjs/ember.js/blob/v1.11.0-beta.4/packages/ember-application/lib/system/application.js#L1106-L1126). After a little digging it appears that initializers run after [that method is called](https://github.com/emberjs/ember.js/blob/v1.11.0-beta.4/packages/ember-application/lib/system/application.js#L282), so the app version isn't in the list when it's printed. Not a big deal, but I've definitely found it handy to find the version in the console without opening the ember inspector and clicking the info tab (I used to call `Ember.libraries.register` in `app/app.js` directly).

I would have opened a PR, but I can't figure out how to use addon hooks to run code before `Ember.Application#init` is called. The only thing I could think of was to add an inline script using the `contentFor` hook, but that ends up violating CSP. Do you have any idea how to do this?

Start with the linked Ember application.js sections showing the library debug output and the Application#init call order. Read the addon's initializer and contentFor hook behavior, along with the existing app/app.js registration approach. Done means the app version appears in the normal console library output without violating CSP.

Written by the indexing model from the issue text.