Use wp_link_pages in twitter bootstrap 3

gistfile1.php

function spacedmonkey_pages($old){
	$old['before'] = '<ul class="pagination"><li class="disabled"><span>Pages: </span></li>';
	$old['after'] = '</ul>';
	$old['link_before'] = '<span class="">';
	$old['link_after'] = '</span>';
	return $old;
}

add_filter( 'wp_link_pages_args', 'spacedmonkey_pages' );

function spacedmonkey_pages_link($old){
	$class = (strpos($old,'<a') !== false) ? '' : 'active';
	$new = "<li class='$class'>$old</li>";	
	return $new;
}

add_filter( 'wp_link_pages_link', 'spacedmonkey_pages_link' );