delete assets

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-for-japan/trunk@936901 b8457f37-d9ea-0310-8a92-e5e31aec5664
Change Readme file

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-for-japan/trunk@936903 b8457f37-d9ea-0310-8a92-e5e31aec5664