更新到1.4.0 代码全部重构

git-svn-id: https://plugins.svn.wordpress.org/wp2pcs/trunk@1043388 b8457f37-d9ea-0310-8a92-e5e31aec5664
更新readme

git-svn-id: https://plugins.svn.wordpress.org/wp2pcs/trunk@1043396 b8457f37-d9ea-0310-8a92-e5e31aec5664