Fixed bug with special characters in seller IDs

git-svn-id: https://plugins.svn.wordpress.org/auction-nudge/trunk@965821 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated readme.txt "Tested up to" value

git-svn-id: https://plugins.svn.wordpress.org/auction-nudge/trunk@965826 b8457f37-d9ea-0310-8a92-e5e31aec5664