Add option to create/add new item or just listen type-text

Fix #154 #148 and #112

I've added v.1.3.0 compatibility with the Forked Chosen from @koenpunt, so we're able to add/create new item.

First step is switch from oficial chosen.js and chosen.css to koenpunt/chosen versions.
You can download it here: https://github.com/koenpunt/chosen/releases

Then, you'll have 4 new attributes: create-option-text, persistent-create-option, skip-no-results and create-option

To Create new option, use like that:

$scope.name = 'Multiple Angular Chosen Example add new option';
  $scope.state = ['California', 'Arizona'];
  $scope.states = [
    'Alaska',
    'Arizona',
    'Arkansas',
    'California'
  ];

  $scope.createOption = function(term) {
    $scope.$apply(function() {
      $scope.states.push(term);
      $scope.state.push(term);
    });
  }

<select multiple
        chosen
        create-option-text="'Create item'"
        persistent-create-option="true"
        skip-no-results="true"
        create-option="createOption"
        ng-model="state"
        ng-options="s for s in states">
  <option value=""></option>
</select>

Here is an example working http://plnkr.co/edit/xZ5XbO?p=preview