Add copyright & license information

git-svn-id: https://plugins.svn.wordpress.org/toolbox/trunk@929368 b8457f37-d9ea-0310-8a92-e5e31aec5664
Add copyright & license information

git-svn-id: https://plugins.svn.wordpress.org/toolbox/trunk@929379 b8457f37-d9ea-0310-8a92-e5e31aec5664