readme updates

git-svn-id: https://plugins.svn.wordpress.org/opendoor-social-referral-and-content-marketing/trunk@947306 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme updates

git-svn-id: https://plugins.svn.wordpress.org/opendoor-social-referral-and-content-marketing/trunk@947307 b8457f37-d9ea-0310-8a92-e5e31aec5664