delete plugin class

git-svn-id: https://plugins.svn.wordpress.org/social-share-pop/trunk@903937 b8457f37-d9ea-0310-8a92-e5e31aec5664
add file plugin class

git-svn-id: https://plugins.svn.wordpress.org/social-share-pop/trunk@903940 b8457f37-d9ea-0310-8a92-e5e31aec5664