Release of version 3.0

git-svn-id: https://plugins.svn.wordpress.org/admin-bar-button/trunk@1022079 b8457f37-d9ea-0310-8a92-e5e31aec5664
Retry of release of version 3.0

git-svn-id: https://plugins.svn.wordpress.org/admin-bar-button/trunk@1022083 b8457f37-d9ea-0310-8a92-e5e31aec5664
Minor correction to release of version 3.0

git-svn-id: https://plugins.svn.wordpress.org/admin-bar-button/trunk@1022084 b8457f37-d9ea-0310-8a92-e5e31aec5664