Releasing 4.0.1

git-svn-id: https://plugins.svn.wordpress.org/addthis/trunk@1025147 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating Version number

git-svn-id: https://plugins.svn.wordpress.org/addthis/trunk@1025150 b8457f37-d9ea-0310-8a92-e5e31aec5664