Added do_action( 'dfrpswc_do_product', $post, $product, $set, $action ) to dfrpswc_do_products() function so users can perform an action after a product has been imported/updated.

git-svn-id: https://plugins.svn.wordpress.org/datafeedr-woocommerce-importer/trunk@870934 b8457f37-d9ea-0310-8a92-e5e31aec5664