Test specific fixtures

Test names are set into header when ajax request is made:

```javascript
QUnit.testStart(function(details) {
  Ember.$.ajaxSetup({
    headers: {
      'x-test-id': '' + details.module + ' ' + details.name
    }
  });
});

QUnit.testDone(function() {
  Ember.$.ajaxSetup({
    headers: {
      'x-test-id': undefined
    }
  });
});
```