(Jan 27 2012, from branches/stable/0.6.x)
* Security fix to enhance sanitizing of CSS in style attributes. Genshi's
`HTMLSanitizer` disallows style attributes by default (this remains
unchanged) and warns against such attacks in its documentation, but
the provided CSS santizing is now less lacking (see 455).
* Fix for error in how `HTMLFormFiller` would handle `textarea` elements if
no value was not supplied form them.
* The `HTMLFormFiller` now correctly handles check boxes and radio buttons
with an empty `value` attribute.
* Template `Context` objects now have a `.copy` method.
* Added a simple `tox.ini` file for using tox to test against multiple
verions of Python.
* Fix for bug in `QName` comparison (see 413).
* Fix for bug in handling of trailing events in match template matches
(see 399).
* Fix i18n namespace declaration in documentation (see 400).
* Fix for bug in caching of events in serializers by no longer caching
`(TEXT, Markup)` events (see 429).
* Fix handling of `None` by `Markup.escape` in `_speedups.c` (see 439).
* Fix handling of internal state by match templates (relevant when multiple
templates match the same part of the stream, see 370).
* Fix handling of multiple events between or on either side of start and end
tags in translated messages (see 404).
* Fix test failures caused by changes in HTMLParser in Python 2.7 (see 501).
* Fix infinite loop in interplotation lexing that was introduced by a change
in Python 2.7's tokenizer (see 540).
* Fix handling of processing instructions without data (see 368).
* Updated MANIFEST.in so as not to rely on build from Subersion 1.6.