[1.8.x] Removed a prominent note about django.utils.unittest deprecation.

Django's unit tests use a Python standard library module: :mod:`unittest`. This

module defines tests using a class-based approach.

.. admonition:: unittest2

    .. deprecated:: 1.7

    Python 2.7 introduced some major changes to the ``unittest`` library,

    adding some extremely useful features. To ensure that every Django project

    could benefit from these new features, Django used to ship with a copy of

    Python 2.7's ``unittest`` backported for Python 2.6 compatibility.

    Since Django no longer supports Python versions older than 2.7,

    ``django.utils.unittest`` is deprecated. Simply use ``unittest``.

.. _unittest2: https://pypi.python.org/pypi/unittest2

Here is an example which subclasses from :class:`django.test.TestCase`,

which is a subclass of :class:`unittest.TestCase` that runs each test inside a

transaction to provide isolation::