fixed bug with add new post where ID wasn't available in GET but now we use global post instead

git-svn-id: https://plugins.svn.wordpress.org/ns-seo-custom-fields/trunk@1035226 b8457f37-d9ea-0310-8a92-e5e31aec5664
quick update to readme.txt giving @tncdesigns credit for the bug catch and fix suggestion

git-svn-id: https://plugins.svn.wordpress.org/ns-seo-custom-fields/trunk@1035227 b8457f37-d9ea-0310-8a92-e5e31aec5664