Fix for proper post url in Custom Button Code option

git-svn-id: https://plugins.svn.wordpress.org/addthis/trunk@785868 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated to 3.5.3

git-svn-id: https://plugins.svn.wordpress.org/addthis/trunk@785933 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix for template tag not working

git-svn-id: https://plugins.svn.wordpress.org/addthis/trunk@785966 b8457f37-d9ea-0310-8a92-e5e31aec5664