Hidden input wpsc_ajax_action not being defined for all WPeC AJAX
Hidden feilds for wpsc_ajax_action added for update quantity ajax requests to be consistant with more recent code additions.  This means that all user interface ajax requests have the wpsc_ajax_action POST paramter defined.  Any conditional processing with the AJAX rougines based on this parameter will now happen consistantly.
Merge branch 'pr-customer-meta-checkout-country-region-currency' into dev-master