Add page-slug to body class of wordpress pages

gistfile1.php

<?php
// Add to functions.php

// Add page-slug to body
function add_body_class( $classes )
{
    global $post;
    if ( isset( $post ) ) {
      if (substr($post->post_type, 0, 4) == 'page') {
	        $classes[] = $post->post_type . '-' . $post->post_name;
    	}
    }
    return $classes;
}
add_filter( 'body_class', 'add_body_class' );

?>