New version 3.0

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1031035 b8457f37-d9ea-0310-8a92-e5e31aec5664
delete images no used

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1031036 b8457f37-d9ea-0310-8a92-e5e31aec5664