Updated ShortCode routine for local caching.

git-svn-id: https://plugins.svn.wordpress.org/listly/trunk@785679 b8457f37-d9ea-0310-8a92-e5e31aec5664
Changing API URL.

git-svn-id: https://plugins.svn.wordpress.org/listly/trunk@786228 b8457f37-d9ea-0310-8a92-e5e31aec5664