Sync a textarea backed instance when the editor changes

Added a listener on the editable element to watch for changes that will call a function to sync the data with the textarea
Added a data element to the editor that contains the 'holder' when it is backed by a textarea so that the sync can be maintained
Added a function to the dom to sync the current content of the editor to the backing text area
Fire change and keyup events on the backing textarea when the sync happens so that anything watching these events are notified (like validation)