Update contao210 and contao210-example package to 2.10.4.

Version 2.10.4 (2011-12-30)
---------------------------
- Fixed: the Environment class did not always return the correct script name
  (#3603)
- Fixed: close the connection after sending a file to the browser (#3602)
- Fixed: the new Ajax cron trigger did not work in IE8 due to missing
  Date.now() support (#3681)
- Fixed: do not block ressources required by the Google website preview in the
  robots.txt file (#3688)
- Fixed: correctly update the cache after a new template has been created
  (#3676)
- Fixed: correctly handle HTML comments in inline JavaScripts (#3696)
- Fixed: get the next autoincrement ID when importing a theme so deleted
  themes can be restored (#3604)
- Fixed a few minor issues

(taca)