removed assets dir

git-svn-id: https://plugins.svn.wordpress.org/post-list-featured-image/trunk@981061 b8457f37-d9ea-0310-8a92-e5e31aec5664
removed assets dir

git-svn-id: https://plugins.svn.wordpress.org/post-list-featured-image/trunk@981062 b8457f37-d9ea-0310-8a92-e5e31aec5664