new transitions & several enhancements

git-svn-id: https://plugins.svn.wordpress.org/widgets-in-tabs/trunk@963359 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix readme typos

git-svn-id: https://plugins.svn.wordpress.org/widgets-in-tabs/trunk@963360 b8457f37-d9ea-0310-8a92-e5e31aec5664