Change theme before publishing, for getting a good html code highlight style through htmlize.

change-theme-before-publish.el

(defadvice org-publish (around fsh-org-publish-advice
                                        (project &optional force async) activate)
  "Change theme before publishing, for getting a good html code highlight style through
htmlize."
  (let ((thems custom-enabled-themes))
      (dolist (theme thems)
        (disable-theme theme))
      (load-theme 'github)
      ad-do-it
      (disable-theme 'github)
      (dolist (theme thems)
        (enable-theme theme))
      ))