* **updater** is a function to be applied to every item currently in the buffer. The function will receive 3 parameters: `item`, `scope`, and `element`. Here `item` is the item to be affected, `scope` is the item $scope, and `element` is the html element for the item. The return value of the function should be an array of items. Similarly to the `newItem` parameter (see above), if the array is empty(`[]`), the item is deleted, otherwise the item is replaced by the items in the array. If the return value is not an array, the item remains unaffected, unless some updates were made to the item in the updater function. This can be thought of as in place update.
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