ember-cli addon

I am publishing the PR so there could be more eyes on it. It is not ready to merge.

- [ ] cleanup generated files
- [ ] complete the README with new instructions
- [ ] make sure I did not make some stuff worse in the process of refactoring :)
- [ ] add some basic tests

Mainly I would like some feedback on how I manage configuration. Is it too much magic?
I suspect reorganizing this will work nicely in today's code. But I have been wanting to explore adding container.onlookup callbacks to support this case