applying `ngFile.js` but pushing files to model

ngFileQueue.js

.directive('ngFile', ['$parse', function($parse){
  return {
    restrict: 'A',
    require: 'ngModel',
    link: function($scope, $element, attrs){
      $element.bind('change', function(event){
        $scope.$apply(function($scope){
          Array.prototype.push.apply($parse(attrs.ngModel)($scope), event.target.files || [])
        })
      })
    }
  }
}])