git_get_commit_info(): take first 40 chars from commit log's first line.
tree3c61cfe827c656641439c91913f7ebc19df2e94d
-rw-r--r-- 20 .gitignore
-rw-r--r-- 77 .htaccess
-rw-r--r-- 50 default.css
drwxr-xr-x - doc
drwxr-xr-x - inc
-rw-r--r-- 3475 index.php
drwxr-xr-x - templates