1.5.24 - new callback field, shortcode contextual tokens, index on overrides table

git-svn-id: https://plugins.svn.wordpress.org/query-wrangler/trunk@899093 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme typo

git-svn-id: https://plugins.svn.wordpress.org/query-wrangler/trunk@899098 b8457f37-d9ea-0310-8a92-e5e31aec5664