Updated for WooCommerce 2.1.2

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-incremental-product-quantities/trunk@859090 b8457f37-d9ea-0310-8a92-e5e31aec5664
Quick Edit Bug Fix.

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-incremental-product-quantities/trunk@859659 b8457f37-d9ea-0310-8a92-e5e31aec5664
Undefined variable update.

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-incremental-product-quantities/trunk@859701 b8457f37-d9ea-0310-8a92-e5e31aec5664
Minor bug fixes, validation and rounding errors.

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-incremental-product-quantities/trunk@859828 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added back WC 2.0.x validation compatability.

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-incremental-product-quantities/trunk@860457 b8457f37-d9ea-0310-8a92-e5e31aec5664