Clarify .build() issue with Django>1.8 (Ref #198).

From 1.8 onwards, this crashes:

>>> a = MyModel()  # Don't save
>>> b = MyOtherModel(fkey_to_mymodel=a)

In turn, it breaks:

    class MyModelFactory(factory.django.DjangoModelFactory):
        class Meta:
            model = MyModel

    class MyOtherModelFactory(factory.django.DjangoModelFactory):
        class Meta:
            model = MyOtherModel
        fkey_to_mymodel = factory.SubFactory(MyModelFactory)

    MyOtherModelFactory.build()  # Breaks

The error message is: Cannot assign "MyModel()": "MyModel" instance isn't saved in the database.

See https://code.djangoproject.com/ticket/10811 for details.

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