code: function() {
        var self = this;
        Parse._arrayEach(arguments, function(key) {
          if (_.isArray(key)) {
            self._include = self._include.concat(key);
          } else {
            self._include.push(key);
          }
        });
        return this;
      }
docs: Include nested Parse.Objects for the provided key.  You can use dot
  notation to specify which fields in the included object are also fetch.
  @param {String} key The name of the key to include.
  @return {Parse.Query} Returns the query, so you can chain this call.