title: Factory Boy date provider is returning string
body: <p>So, I've been working in some app using the factory_boy package to generate some random data and I'm suffering with the date provider :(</p>
  
  <pre class="lang-py prettyprint-override"><code>class MyModel(models.Model):
      date = models.DateField()
  
  class MyModelFactory(factory.DjangoModelFactory):
      date = factory.Faker('date')
  
      class Meta:
          model = MyModel
  
  my_model = MyModelFactory()
  my_model.date # '2010-05-20'
  </code></pre>
  
  <p>Someone know how can I make the faker return a real date object?</p>