Merge branch 'ff-artifacts-date-fix' into 'master'

Fixed artifacts expire date in FF

## What does this MR do?

FireFox was trying to parse the date incorrectly so it would just show 'Past due'

## Screenshots (if relevant)

![Screen_Shot_2016-07-21_at_17.16.57](/uploads/938d39c648dc98540cd991cf552276dd/Screen_Shot_2016-07-21_at_17.16.57.png)

See merge request !5403

app/assets/javascripts/build.js

@@ -128,7 +128,7 @@
       $date = $('.js-artifacts-remove');
       if ($date.length) {
         date = $date.text();
-        return $date.text($.timefor(new Date(date), ' '));
+        return $date.text($.timefor(new Date(date.replace(/-/g, '/')), ' '));
       }
     };