MOdified r:stat() to return finer time granularity.

the atime, mtime, ctime, size values ar now in mod_lua
64bit as received from apr_stat().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1467427 13f79535-47bb-0310-9956-ffa450edef68