Update toolbar

git-svn-id: https://plugins.svn.wordpress.org/altos-toolbar/trunk@905848 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme for version 1.5.1

git-svn-id: https://plugins.svn.wordpress.org/altos-toolbar/trunk@905851 b8457f37-d9ea-0310-8a92-e5e31aec5664