程式修改

1. 先列出修改前後，有那些檔案被更動，再逐一說明。結果共有 3 個檔被更動過。

   [root@dywang moodle23]# diff -qr mod_tmp/elcentra auth/elcentra/
   Files mod_tmp/elcentra/auth.php and auth/elcentra/auth.php differ
   Files mod_tmp/elcentra/eblib/facebook.php and auth/elcentra/eblib/facebook.php differ
   Files mod_tmp/elcentra/eblib/google.php and auth/elcentra/eblib/google.php differ