tagging v0.5.0

git-svn-id: https://plugins.svn.wordpress.org/custom-content-shortcode/trunk@824201 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagging v0.5.0

git-svn-id: https://plugins.svn.wordpress.org/custom-content-shortcode/trunk@824207 b8457f37-d9ea-0310-8a92-e5e31aec5664
edited readme

git-svn-id: https://plugins.svn.wordpress.org/custom-content-shortcode/trunk@824213 b8457f37-d9ea-0310-8a92-e5e31aec5664
edited readme

git-svn-id: https://plugins.svn.wordpress.org/custom-content-shortcode/trunk@824226 b8457f37-d9ea-0310-8a92-e5e31aec5664