speed.php has been removed

git-svn-id: https://plugins.svn.wordpress.org/wp-fastest-cache/trunk@1005180 b8457f37-d9ea-0310-8a92-e5e31aec5664
ajax revert action has been added

git-svn-id: https://plugins.svn.wordpress.org/wp-fastest-cache/trunk@1005182 b8457f37-d9ea-0310-8a92-e5e31aec5664