Finalize WP Admin Microblog 2.3.1 (adds a missing file)

git-svn-id: https://plugins.svn.wordpress.org/wp-admin-microblog/trunk@927449 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix readme

git-svn-id: https://plugins.svn.wordpress.org/wp-admin-microblog/trunk@927451 b8457f37-d9ea-0310-8a92-e5e31aec5664