added the affiliates_redirect_status_code filter

git-svn-id: https://plugins.svn.wordpress.org/affiliates/trunk@809375 b8457f37-d9ea-0310-8a92-e5e31aec5664
added missing 300 and converting code to int

git-svn-id: https://plugins.svn.wordpress.org/affiliates/trunk@809377 b8457f37-d9ea-0310-8a92-e5e31aec5664