Released v6.0.6

* Continue the regression fix from 6.0.5 which was not a complete fix.

Released v6.0.5

* Fix a regression with 6.0.4 under Windows where most commands would raise an
  exception due to Windows not having the ``os.geteuid()`` function.

Released pip v6.0.4

* Fix an issue where ANSI escape codes would be used on Windows even though the
  Windows shell does not support them, causing odd characters to appear with
  the progress bar.

* Fix an issue where using -v would cause an exception saying
  ``TypeError: not all arguments converted during string formatting``.

* Fix an issue where using -v with dependency links would cause an exception
  saying ``TypeError: 'InstallationCandidate' object is not iterable``.

* Fix an issue where upgrading distribute would cause an exception saying
  ``TypeError: expected string or buffer``.

* Show a warning and disable the use of the cache directory when the cache
  directory is not owned by the current use, commonly caused by using ``sudo``
  without the ``-H`` flag.

* Update PEP 440 support to handle the latest changes to PEP 440, particularly
  the changes to ``>V`` and ``<V`` so that they no longer imply ``!=V.*``.

* Document the default cache directories for each operating system.

* Create the cache directory when the pip version check needs to save to it
  instead of silently logging an error.

* Fix a regression where the ``-q`` flag would not properly suppress the
  display of the progress bars.

Released 6.0.3

Released 6.0.2

Released v6.0.1

Released v6.0

Released v1.5.6 - 2014-05-16

* Upgrade requests to 2.3.0 to fix an issue with proxies on Python 3.4.1
  (PR pypa#1821).

Released 1.5.5

Released 1.5.4