Now applying end date extension filter to woo commerce checkouts as well. So if an existing member purchases a product for their level that has an end date, their end date will be extended from the old end date. (Thanks, trishacupra)

git-svn-id: https://plugins.svn.wordpress.org/pmpro-woocommerce/trunk@976231 b8457f37-d9ea-0310-8a92-e5e31aec5664