Drop babel plugins #490

Job	Run time
Tests	1m 33s
Floating Dependencies	1m 42s
Build Tests	2m 31s
Scenario: ember-lts-4.4 \| optional: false	2m 52s
Scenario: ember-lts-4.8 \| optional: false	2m 52s
Scenario: ember-lts-4.12 \| optional: false	3m 4s
Scenario: ember-release \| optional: false	2m 59s
Scenario: ember-beta \| optional: false	2m 59s
Scenario: ember-classic \| optional: false	2m 58s
Scenario: ember-canary \| optional: true	2m 58s
Scenario: embroider-safe \| optional: true	3m 0s
Scenario: embroider-optimized \| optional: true	3m 0s
	32m 28s

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