updated the plugin version to 2.7.1

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-extra-checkout-fields-for-brazil/trunk@816050 b8457f37-d9ea-0310-8a92-e5e31aec5664
removed not useful files

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-extra-checkout-fields-for-brazil/trunk@816052 b8457f37-d9ea-0310-8a92-e5e31aec5664