code: function addObject(array, item) {
        var index = indexOf(array, item);
        if (index === -1) { array.push(item); }
      }
docs: Adds an object to an array. If the array already includes the object this
  method has no effect.
  
  @method addObject
  @param {Array} array The array the passed item should be added to
  @param {Object} item The item to add to the passed array
  
  @return 'undefined'