Log Message:
Update to 0.9.1:

Version 0.9.1
-------------

Released on 2013-10-17.

* **Backward incompatible change from 0.9**:
  :meth:`~GenericTranslator.selector_to_xpath` defaults to
  ignoring pseudo-elements,
  as it did in 0.8 and previous versions.
  (:meth:`~GenericTranslator.css_to_xpath` doesn’t change.)
* Drop official support for Python 2.4 and 3.1,
  as testing was becoming difficult.
  Nothing will break overnight,
  but future releases may on may not work on these versions.
  Older releases will remain available on PyPI.

Version 0.9
-----------

Released on 2013-10-11.

Add parser support for :attr:`functional
pseudo-elements <Selector.pseudo_element>`.

*Update:*
This version accidentally introduced a **backward incompatible** change:
:meth:`~GenericTranslator.selector_to_xpath` defaults to
rejecting pseudo-elements instead of ignoring them.

Version 0.8
-----------

Released on 2013-03-15.

Improvements:

* `#22 <https://github.com/SimonSapin/cssselect/issues/22>`_
  Let extended translators override what XPathExpr class is used
* `#19 <https://github.com/SimonSapin/cssselect/issues/19>`_
  Use the built-in ``lang()`` XPath function
  for implementing the ``:lang()`` pseudo-class
  with XML documents.
  This is probably faster than ``ancestor-or-self::``.

Bug fixes:

* `#14 <https://github.com/SimonSapin/cssselect/issues/14>`_
  Fix non-ASCII pseudo-classes. (Invalid selector instead of crash.)
* `#20 <https://github.com/SimonSapin/cssselect/issues/20>`_
  As per the spec, elements containing only whitespace are not considered empty
  for the ``:empty`` pseudo-class.

Version 0.7.1
-------------

Released on 2012-06-14. Code name *remember-to-test-with-tox*.

0.7 broke the parser in Python 2.4 and 2.5; the tests in 2.x.
Now all is well again.

Also, pseudo-elements are now correctly made lower-case. (They are supposed
to be case-insensitive.)