Added method to find files without reloading

This is just a tiny modification to provide a documented method for checking whether configuration files have changed (path changed, new files, files removed...). This is required to support reloading if configuration files in Iong-running applications only if needed. I hesitated to add support of `reload( $seconds )` which would compare first `find` and `found` and second the modification time of files returned by `found` - what do you think?