Use new module imports (#127)

* Update "ember-cli-babel" to v6.6.0

* Use new module imports

* Split "return" keyword and warn() invocations

This messes up the debug macros Babel plugin apparently...

addon/utils/bind-data-test-attributes.js

@@ -1,6 +1,5 @@
-import Ember from 'ember';
-
-const { warn, isArray } = Ember;
+import { warn } from '@ember/debug';
+import { isArray } from '@ember/array';
 
 const TEST_SELECTOR_PREFIX = /data-test-.*/;
 
@@ -21,19 +20,23 @@ export default function bindDataTestAttributes(component) {
     let message = `ember-test-selectors could not bind data-test-* properties on ${component} ` +
       `automatically because tagName is empty.`;
 
-    return warn(message, false, {
+    warn(message, false, {
       id: 'ember-test-selectors.empty-tag-name',
     });
+
+    return;
   }
 
   let computedBindings = component.attributeBindings && component.attributeBindings.isDescriptor;
   if (computedBindings) {
     let message = `ember-test-selectors could not bind data-test-* properties on ${component} ` +
       `automatically because attributeBindings is a computed property.`;
 
-    return warn(message, false, {
+    warn(message, false, {
       id: 'ember-test-selectors.computed-attribute-bindings',
     });
+
+    return;
   }
 
   let attributeBindings = component.getWithDefault('attributeBindings', []);

package.json

@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "broccoli-stew": "^1.4.0",
-    "ember-cli-babel": "^6.0.0",
+    "ember-cli-babel": "^6.6.0",
     "ember-cli-version-checker": "^2.0.0"
   },
   "devDependencies": {

tests/unit/utils/bind-data-test-attributes-test.js

@@ -1,10 +1,8 @@
 import { module, test } from 'qunit';
-import Ember from 'ember';
+import EmberObject, { computed } from '@ember/object';
 
 import bindDataTestAttributes from 'ember-test-selectors/utils/bind-data-test-attributes';
 
-const { Object: EmberObject, computed } = Ember;
-
 module('Unit | Utility | bind data test attributes');
 
 test('it adds missing attributeBindings array', function(assert) {