Drop babel plugins #492

Job	Run time
Floating Dependencies	1m 14s
Build Tests	2m 15s
Tests	1m 26s
Scenario: ember-lts-4.4 \| optional: false	2m 56s
Scenario: ember-lts-4.8 \| optional: false	3m 3s
Scenario: ember-lts-4.12 \| optional: false	2m 51s
Scenario: ember-release \| optional: false	3m 13s
Scenario: ember-beta \| optional: false	3m 4s
Scenario: ember-classic \| optional: false	2m 54s
Scenario: ember-canary \| optional: true	3m 2s
Scenario: embroider-safe \| optional: true	2m 59s
Scenario: embroider-optimized \| optional: true	2m 57s
	31m 54s

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