Added a filter for plugin cron actions.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@900816 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated the Admin Page Framework library.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@900821 b8457f37-d9ea-0310-8a92-e5e31aec5664