Upgrade to Ember 3.0, refactor from ember-browserify to ember-auto-import and a small fix.
- Merge pull request #247 from internet4000/chore/upgrade-ember (3f4f397)
- Merge pull request #250 from internet4000/ember-auto-import (3eaaf00)
- Fix editing a track without loading all tracks (f1aaebd)
