added support for international donors

git-svn-id: https://plugins.svn.wordpress.org/seamless-donations/trunk@835925 b8457f37-d9ea-0310-8a92-e5e31aec5664
moving stable tag to 2.7.0


git-svn-id: https://plugins.svn.wordpress.org/seamless-donations/trunk@835931 b8457f37-d9ea-0310-8a92-e5e31aec5664