Ember.Enumerable no group by?

[tarasm]

Hey fellas, I turned your code into a computed property

• Code: https://github.com/embersherpa/examples/blob/master/app/utils/group-by.js
• Test: https://github.com/embersherpa/examples/blob/master/tests/unit/utils/group-by_test.js
• Demo: Ember Sherpa Examples