Form POST processing fails to properly handle multiselects

[farmerpaul]

If your form has a multiselect (<select multiple>), then the form processing done by History.js fails to read its selected values correctly. The issue is on this line:

    for (var i = 0, len = elements.length, el; i < len; i++) {
      el = elements[i]
      var name = el.name
      if (!name) continue
      var value = el.value // <== breaks with <select multiple>
      ...

I think that just returns the first selected element, which isn't usually what you want...