code: function nestedArrayAdd (ev) {
      var $actions = $(this)
      // get item container
      var $item = $actions.closest('.nested-array-item')
      // get nested array container
      var $nestedArray = $item.closest('.nested-array')
      // create new item
      var $newItem = $item.clone()
      // remove any extra elements
      $newItem.find('.extra').remove()
      // show any hidden elements
      $newItem.find('.hide').removeClass('hide')
      // clear all values from item inputs
      nestedArrayItemClearValues($newItem)
      // bind event handlers to nested array item
      nestedArrayItemBindEventHandlers($newItem)
      // insert new item after item
      $item.after($newItem)
      // update input names
      nestedArrayRename($nestedArray)
  }
docs: NESTED ARRAY ACTION CONTROLS * 
  @function nestedArrayAdd
  
  add item to nested array