Add Ember Resource 2.0

Original Ember Resource `1.0` PR: https://github.com/cdnjs/cdnjs/pull/965
`2.0` tag in the Ember Resource repository: https://github.com/zendesk/ember-resource/releases/tag/2.0
`2.0` branch: https://github.com/zendesk/ember-resource/tree/2-0-stable