Added field "order by" to sort the variations
Updated images

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-paginate-variations/trunk@1020285 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-paginate-variations/trunk@1020287 b8457f37-d9ea-0310-8a92-e5e31aec5664