Log Message:
Update docutils to 0.4

Components:
* Added an S5/HTML writer and the rst2s5.py front end: multi-platform,
  multi-browser HTML slide shows.
* The newlatex2e writer is nearing completion.
* Added a DocTree reader, publish_doctree and publish_from_doctree convenience
  functions, for document tree extraction and reprocessing.
reStructuredText:
* Added directives: "container" (generic block-level container),
  "default-role" (role used for `backtick` syntax), "title" \ 
(document title
  metadata), and "date" (generate the current local date, for substitution
  definitions).
* Length units are now supported for image sizes.
* Added standard definition files for special characters etc.
Internationalization:
* Added Japanese and Simplified Chinese language mappings, and support for
  double-width CJK-characters in tables and section titles.
Documentation:
* Added a guide for distributors (package maintainers) and a guide for
  developers.
General:
* Added significant Emacs support for reST.
* Added a --strip-comments option.
* --embed-stylesheet is now the default for the HTML writer (rather than
  --link-stylesheet).