release 2.2.0

git-svn-id: https://plugins.svn.wordpress.org/frontend-checklist/trunk@863802 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed readme.txt markup

git-svn-id: https://plugins.svn.wordpress.org/frontend-checklist/trunk@863806 b8457f37-d9ea-0310-8a92-e5e31aec5664