[In Progress] Ember CLI compatibility

This is a work-in-progress for adding ember-cli compatibility.  Items remaining are:

* Get existing build process to work
* Get un-calendar template to appear in consuming application.

@ghedamat, looking to get your feedback.  I went through examples you pointed out, but it seems that moving files in `lib` into `app-addon` is the only way to register a custom component with ember-cli.  For consistency, I did the same with the other components of the applicant (i.e. `un-calendar.css`).  It should be possible to update `Brocfile.js` to take into account the changes so the existing build process can be maintained.