adding cache

git-svn-id: https://plugins.svn.wordpress.org/manchete-atual-newsfeed/trunk@762510 b8457f37-d9ea-0310-8a92-e5e31aec5664
cache bug fixed

git-svn-id: https://plugins.svn.wordpress.org/manchete-atual-newsfeed/trunk@762512 b8457f37-d9ea-0310-8a92-e5e31aec5664