update to 2.2.4

git-svn-id: https://plugins.svn.wordpress.org/share-social/trunk@877600 b8457f37-d9ea-0310-8a92-e5e31aec5664
update to 2.2.4

git-svn-id: https://plugins.svn.wordpress.org/share-social/trunk@877603 b8457f37-d9ea-0310-8a92-e5e31aec5664