Home page slider custom post type

gistfile1.txt

/**
 * Home page slider function to create a main slider
 *
 * @return void
 * @author Sam East  
 */
function home_slider_post_type() {
  $labels = array(
    'name'               => _x( 'Home Slider', 'post type general name' ),
    'singular_name'      => _x( 'Home Slider', 'post type singular name' ),
    'add_new'            => _x( 'Add New', 'Slider' ),
    'add_new_item'       => __( 'Add New Slide' ),
    'edit_item'          => __( 'Edit Slide' ),
    'new_item'           => __( 'New Slide' ),
    'all_items'          => __( 'All Slide' ),
    'view_item'          => __( 'View Slide' ),
    'search_items'       => __( 'Search Slide' ),
    'not_found'          => __( 'No Slide found' ),
    'not_found_in_trash' => __( 'No Slide found in the Trash' ), 
    'parent_item_colon'  => '',
    'menu_name'          => 'Home Slider'
  );
  $args = array(
    'labels'        => $labels,
    'description'   => 'Holds our Slides for home slider',
    'public'        => true,
    'menu_position' => 5,
    'supports'      => array( 'title', 'editor', 'thumbnail', 'excerpt', 'comments' ),
    'has_archive'   => true,
  );
  register_post_type( 'HomeSlider', $args ); 
}
add_action( 'init', 'home_slider_post_type' );


<?php $loop = new WP_Query( array( 'post_type' => 'HomeSlider', '4' => -1 ) ); 
    while ( $loop->have_posts() ) : $loop->the_post();
    $feat_image = wp_get_attachment_url( get_post_thumbnail_id($post->ID) ); ?>
    <header class="clearfix headerwrap_inner" style="background-image: url('<?php echo $feat_image; ?>');"><h1><span class="icon icon-shield"></span></h1><p><?php the_title(); ?></p><p><?php the_content(); ?></p></header>
  <?php endwhile; wp_reset_query(); ?>