Fix encoding bug for credit lines containing HTML tags

git-svn-id: https://plugins.svn.wordpress.org/media-credit/trunk@1014091 b8457f37-d9ea-0310-8a92-e5e31aec5664
Remove debug info

git-svn-id: https://plugins.svn.wordpress.org/media-credit/trunk@1014095 b8457f37-d9ea-0310-8a92-e5e31aec5664