Replace ember-cli-qunit with ember-qunit (ember-cli#436)

Replace ember-cli-qunit with ember-qunit

Author: xg-wang

package.json

@@ -64,13 +64,13 @@
     "ember-cli-htmlbars": "^4.2.0",
     "ember-cli-inject-live-reload": "^2.0.1",
     "ember-cli-pretender": "^3.2.0",
-    "ember-cli-qunit": "^4.3.2",
     "ember-cli-typescript-blueprints": "^3.0.0",
     "ember-cli-uglify": "^3.0.0",
     "ember-data": "~3.14.0",
     "ember-disable-prototype-extensions": "^1.1.2",
     "ember-load-initializers": "^2.1.1",
     "ember-maybe-import-regenerator": "^0.1.6",
+    "ember-qunit": "^4.6.0",
     "ember-resolver": "^7.0.0",
     "ember-source": "~3.16.0",
     "ember-source-channel-url": "^2.0.1",