clean up tabs.

git-svn-id: https://plugins.svn.wordpress.org/insert-pages/trunk@808515 b8457f37-d9ea-0310-8a92-e5e31aec5664
improve documentation. v1.3.

git-svn-id: https://plugins.svn.wordpress.org/insert-pages/trunk@808516 b8457f37-d9ea-0310-8a92-e5e31aec5664