added script to remove js from wp_head and wp_footer

git-svn-id: https://plugins.svn.wordpress.org/wp-asset-manager/trunk@893529 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated README

git-svn-id: https://plugins.svn.wordpress.org/wp-asset-manager/trunk@893532 b8457f37-d9ea-0310-8a92-e5e31aec5664