Not persisted Ember Data

HTML

<script src="https://github.com/downloads/emberjs/ember.js/ember-0.9.5.js"></script>
<script src="https://github.com/downloads/emberjs/data/ember-data-latest.js"></script>
<script type="text/x-handlebars" >
</script>

JavaScript

App = Ember.Application.create({});

App.Person = DS.Model.extend({
    firstName: DS.attr('string'),
    lastName: DS.attr('string'),
    birthday: DS.attr('date'),

    fullName: function() {
        return this.get('firstName') + ' ' + this.get('lastName');
    }.property('firstName', 'lastName')
});

App.store = DS.Store.create({
    adapter: DS.RESTAdapter.create({
        bulkCommit: false,
        ajax: function() {
            console.log(arguments);
        }
    })
});

var persisted = App.store.createRecord(App.Person,  { name: "Brohuda" });
var notPersisted = App.store.createModel(App.Person,  { name: "Yehuda" });

App.store.commit()