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?
this should be:

`this.addBowerPackagesToProject` (notice the s)

the `RSVP.all` runs then concurrently, which will result in mangled output and if the user is prompted via inquirer it will be impossible for them to resolve the issues.