Update to 3.10:

3.10 (2011-05-30)
-----------------

* Do not try to build LibYAML bindings on platforms other than CPython
  (Thank to olt(at)bogosoft(dot)com).
* Clear cyclic references in the parser and the emitter
  (Thank to kristjan(at)ccpgames(dot)com).
* Dropped support for Python 2.3 and 2.4.

3.09 (2009-08-31)
-----------------

* Fixed an obscure scanner error not reported when there is
  no line break at the end of the stream (Thank to Ingy).
* Fixed use of uninitialized memory when emitting anchors with
  LibYAML bindings (Thank to cegner(at)yahoo-inc(dot)com).
* Fixed emitting incorrect BOM characters for UTF-16 (Thank to
  Valentin Nechayev)
* Fixed the emitter for folded scalars not respecting the preferred
  line width (Thank to Ingy).
* Fixed a subtle ordering issue with emitting '%TAG' directives
  (Thank to Andrey Somov).
* Fixed performance regression with LibYAML bindings.


(wiz)