<?php

// WP_Query arguments
$args = array (
	'order'                  => 'ASC',
	'orderby'                => 'menu_order',
	'meta_query'             => array(
		array(
			'key'       => 'include_in_homepage_slider',
		),
	),
);

// The Query
$query = new WP_Query( $args );

// The Loop
if ( $query->have_posts() ) {
	echo '<ul class="bxslider">';
	while ( $query->have_posts() ) {
		$query->the_post();
		echo '<li>' . the_post_thumbnail() . '</li>';
	}
	echo '</ul>';
} else {
	// no posts found
}
/* Restore original Post Data */
wp_reset_postdata();

?>				

<script>
	jQuery(document).ready(function($){
	  $('.bxslider').bxSlider();
	});
</script>