Add Action for when saving termorder

git-svn-id: https://plugins.svn.wordpress.org/custom-taxonomy-order-ne/trunk@966329 b8457f37-d9ea-0310-8a92-e5e31aec5664
Formatting of readme

git-svn-id: https://plugins.svn.wordpress.org/custom-taxonomy-order-ne/trunk@966332 b8457f37-d9ea-0310-8a92-e5e31aec5664