Pass attributes to the default canvas in new Ember versions #475

Job	Run time
Tests	59s
Floating Dependencies	47s
Build Tests	1m 46s
Scenario: ember-lts-3.28 \| optional: false	1m 37s
Scenario: ember-lts-4.4 \| optional: false	1m 35s
Scenario: ember-release \| optional: false	1m 37s
Scenario: ember-beta \| optional: false	1m 37s
Scenario: ember-classic \| optional: false	1m 35s
Scenario: ember-canary \| optional: true	1m 37s
Scenario: embroider-safe \| optional: true	1m 37s
Scenario: embroider-optimized \| optional: true	1m 42s
	16m 29s

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