Added support for WP E-Commerce Shopping cart.

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@775617 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added support for profit sharing to Supported Shopping Carts.

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@775618 b8457f37-d9ea-0310-8a92-e5e31aec5664