Update to 3.1.0:

3.1.0 (2013-02-10)
==================

Features added
--------------

* GH#89: lxml.html.clean allows overriding the set of attributes that it
  considers 'safe'.  Patch by Francis Devereux.

Bugs fixed
----------

* LP#1104370: ``copy.copy(el.attrib)`` raised an exception.  It now returns
  a copy of the attributes as a plain Python dict.

* GH#95: When used with namespace prefixes, the  ``el.find*()`` methods
  always used the first namespace mapping that was provided for each
  path expression instead of using the one that was actually passed
  in for the current run.

* LP#1092521, GH#91: Fix undefined C symbol in Python runtimes compiled
  without threading support.  Patch by Ulrich Seidl.

Other changes
-------------

3.1beta1 (2012-12-21)
=====================

Features added
--------------

* New build-time option ``--with-unicode-strings`` for Python 2 that
  makes the API always return Unicode strings for names and text
  instead of byte strings for plain ASCII content.

* New incremental XML file writing API ``etree.xmlfile()``.

* E factory in lxml.objectify is callable to simplify the creation of
  tags with non-identifier names without having to resort to getattr().

Bugs fixed
----------

* When starting from a non-namespaced element in lxml.objectify, searching
  for a child without explicitly specifying a namespace incorrectly found
  namespaced elements with the requested local name, instead of restricting
  the search to non-namespaced children.

* GH#85: Deprecation warnings were fixed for Python 3.x.

* GH#33: lxml.html.fromstring() failed to accept bytes input in Py3.

* LP#1080792: Static build of libxml2 2.9.0 failed due to missing file.

Other changes
-------------

* The externally useless class ``_ObjectifyElementMakerCaller`` was
  removed from the module API of lxml.objectify.

* LP#1075622: lxml.builder is faster for adding text to elements with
  many children.  Patch by Anders Hammarquist.


(wiz)