Update marketplace endpoints
Don't throw deprecated notice in wpsc_google_checkout(), instead, rely on documentation to deprecate.  Needlessly throws notices on cart-widget.php, which many will have in their active theme folder.
Add third  parameter to wpsc_remove_item action, as it provides helpful context for the item being removed, context which is unavailable elsewhere.
Fix improperly interpolated variable in checkout fields.
Merge branch 'master' of github.com:wp-e-commerce/WP-e-Commerce