Updating CPSS to version 1.3. For more information, go to https://github.com/jp1971/cpss.

git-svn-id: https://plugins.svn.wordpress.org/compatible-post-sharing-system/trunk@975520 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating readme.

git-svn-id: https://plugins.svn.wordpress.org/compatible-post-sharing-system/trunk@975522 b8457f37-d9ea-0310-8a92-e5e31aec5664