Version 1.6.8 release

git-svn-id: https://plugins.svn.wordpress.org/cart66-cloud/trunk@839299 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating readme for 1.6.8

git-svn-id: https://plugins.svn.wordpress.org/cart66-cloud/trunk@839305 b8457f37-d9ea-0310-8a92-e5e31aec5664