Recent Post Taxonomy

add_filter('widget_posts_args', 'widget_posts_args_add_custom_type'); 
function widget_posts_args_add_custom_type($params) {
	$params['tax_query'] = array(
		array(
			'taxonomy' => 'thesis_content',
			'field' => 'slug',
			'terms' => array( 'classic-skin', 'pearsonified-skin' )
		)
		/*,
		array(
			'taxonomy' => 'genesis_content',
			'field' => 'slug',
			'terms' => array(),
		)
		*/
	);
   return $params;
}