added rich pin test tool link & screenshot 16

git-svn-id: https://plugins.svn.wordpress.org/nextgen-facebook/trunk@754480 b8457f37-d9ea-0310-8a92-e5e31aec5664
screenshot 16

git-svn-id: https://plugins.svn.wordpress.org/nextgen-facebook/trunk@754482 b8457f37-d9ea-0310-8a92-e5e31aec5664