Log Message:
Update to 1.10:

1.10 (2013-07-23)
~~~~~~~~~~~~~~~~~

* **BACKWARDS INCOMPATIBLE** Dropped support for Python 2.5. The minimum
  supported Python version is now Python 2.6.

* **BACKWARDS INCOMPATIBLE** Using ``virtualenv.py`` as an isolated script
  (i.e. without an associated ``virtualenv_support`` directory) is no longer
  supported for security reasons and will fail with an error.

  Along with this, ``--never-download`` is now always pinned to ``True``, and
  is only being maintained in the short term for backward compatibility
  (Pull #412).

* **IMPORTANT** Switched to the new setuptools (v0.9.7) which has been merged
  with Distribute_ again and works for Python 2 and 3 with one codebase.
  The ``--distribute`` and ``--setuptools`` options are now no-op.

* Updated to pip 1.4.

* Added support for PyPy3k

* Added the option to use a version number with the ``-p`` option to get the
  system copy of that Python version (Windows only)

* Removed embedded ``ez_setup.py``, ``distribute_setup.py`` and
  ``distribute_from_egg.py`` files as part of switching to merged setuptools.

* Fixed ``--relocatable`` to work better on Windows.

* Fixed issue with readline on Windows.

.. _Distribute: https://pypi.python.org/pypi/distribute