code: function DocumentClient(options) {
      var self = this;
      self.options = options || {};
      self.configure(self.options);
    }
docs: Creates a DynamoDB document client with a set of configuration options.
  
  @option options params [map] An optional map of parameters to bind to every
  request sent by this service object.
  @option options service [AWS.DynamoDB] An optional pre-configured instance
  of the AWS.DynamoDB service object to use for requests. The object may
  bound parameters used by the document client.
  @option options convertEmptyValues [Boolean] set to true if you would like
  the document client to convert empty values (0-length strings, binary
  buffers, and sets) to be converted to NULL types when persisting to
  DynamoDB.
  @see AWS.DynamoDB.constructor