ES6 ember-metal, ember-runtime, ember-debug: 1.
ES6 ember-metal, ember-runtime, ember-debug: 2.
ES6 ember-metal, ember-runtime, ember-debug: 3.
ES6 ember-metal, ember-runtime, ember-debug: 4.
ES6 ember-metal, ember-runtime, ember-debug: 5.
ES6 ember-metal, ember-runtime, ember-debug: 6.
ES6 ember-metal, ember-runtime, ember-debug: 7.
Merge pull request #4374 from fivetanley/es6-ember-metal

ES6 ember-metal && ember-runtime && ember-debug