.directive('typeahead', [function () {
    return {
      restrict: 'A',
      link: function (scope, elem, attrs, controller) {
        elem.typeahead({
          name: 'produtos',
          local: ['Keynes', 'Mises']
        })
        elem.on('typeahead:autocompleted typeahead:selected', function (datum) {
            elem.val(datum.value)
        })
      },
    }