delete all files

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1005366 b8457f37-d9ea-0310-8a92-e5e31aec5664
update 2.3

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1005367 b8457f37-d9ea-0310-8a92-e5e31aec5664
update 2.3

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1005368 b8457f37-d9ea-0310-8a92-e5e31aec5664
update 2.3

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1005372 b8457f37-d9ea-0310-8a92-e5e31aec5664