Replaces serializer test with previous version's

The old version of ember-template had a blank serializer test.
Issue #23 is open because of this, but isn't something we should
be resolving now. The focus of this merge is to de-podify, which
I am hopefully completing by moving the serializer test to the right
directory, and deleting the (now obsolete) tests from the pod-structure.

tests/unit/serializers/application-test.js

@@ -1,15 +1 @@
-import { moduleForModel, test } from 'ember-qunit';
 
-moduleForModel('application', 'Unit | Serializer | application', {
-  // Specify the other units that are required for this test.
-  needs: ['serializer:application']
-});
-
-// Replace this with your real tests.
-test('it serializes records', function(assert) {
-  let record = this.subject();
-
-  let serializedRecord = record.serialize();
-
-  assert.ok(serializedRecord);
-});