1.51 release

git-svn-id: https://plugins.svn.wordpress.org/shortcode-exec-php/trunk@882256 b8457f37-d9ea-0310-8a92-e5e31aec5664
1.51 add missing file

git-svn-id: https://plugins.svn.wordpress.org/shortcode-exec-php/trunk@882258 b8457f37-d9ea-0310-8a92-e5e31aec5664
1.51 updated read me

git-svn-id: https://plugins.svn.wordpress.org/shortcode-exec-php/trunk@882259 b8457f37-d9ea-0310-8a92-e5e31aec5664