updating stable tag

git-svn-id: https://plugins.svn.wordpress.org/wp-dtree-30/trunk@1051347 b8457f37-d9ea-0310-8a92-e5e31aec5664
cleaning readme

git-svn-id: https://plugins.svn.wordpress.org/wp-dtree-30/trunk@1051352 b8457f37-d9ea-0310-8a92-e5e31aec5664