Fixed some errors and missed codes of the new features.

git-svn-id: https://plugins.svn.wordpress.org/speed-booster-pack/trunk@938001 b8457f37-d9ea-0310-8a92-e5e31aec5664
Modified readme.

git-svn-id: https://plugins.svn.wordpress.org/speed-booster-pack/trunk@938005 b8457f37-d9ea-0310-8a92-e5e31aec5664