Don't make duplicated requests through Ember Data

ember-data-storefront provides FastbootAdapter which caches Ajax requests'
resulets in Fastboot's Shoebox. So all requests it made in the FastBoot
server won't be issued again from the browser.

This will prevent duplicated requests on `/crates` and other
Ember Data-powered pages.

Author: kzys

app/adapters/application.js

@@ -1,8 +1,9 @@
 import RESTAdapter from '@ember-data/adapter/rest';
 import { inject as service } from '@ember/service';
 import { computed } from '@ember/object';
+import FastbootAdapter from 'ember-data-storefront/mixins/fastboot-adapter';
 
-export default RESTAdapter.extend({
+export default RESTAdapter.extend(FastbootAdapter, {
   fastboot: service(),
 
   namespace: 'api/v1',