emacs的unicode

emacs 23有了unicode支援
趕快把預設改成utf-8，才有安心的感覺~

;; set up unicode
(prefer-coding-system 'utf-8)
(set-default-coding-systems 'utf-8)
(set-terminal-coding-system 'utf-8)
(set-keyboard-coding-system 'utf-8)