docs: def update_recursively(original, new):
      """
      Recursively update a nested dictionary.
      
      :param original:
          The original nested dictionary to update.
  
      :type original:
          dict
  
      :param new:
          The nested dictionary to use to update the original.
  
      :type new:
          dict
  
      :returns:
          The updated original dictionary.
  
      :rtype:
          dict
      """
  
      for k, v in new.iteritems():
          if isinstance(v, collections.Mapping) \
          and isinstance(original.get(k, None), collections.Mapping):
              r = update_recursively(original.get(k, {}), v)
              original[k] = r
          else:
              original[k] = new[k]
      return original