Change js selectors not to hide table rows that have payment information
Combined js selectors to perform single action when hiding, rather than hide then show
Fix malformed class attribute on "Shipping Address" header row
Fix multiple change events firing on single action.  Seems that the .on/.off calls where out of balance, as each change occured additional .change events were being added.
Merge pull request #977 from JeffPyeBrook/do-not-hide-gateways-on-checkout

Fix for hiding of payment gateway rows on checkout table described in #597 and multiple AJAX requests on click of shipping same as billing