code: function copier(key, value, ignoredKeys, object) {
      if ( !ignoredKeys || !ignoredKeys.hasOwnProperty(key)) {
        object[key] = value;
      }
    }
docs: Util for extend() to copy a map of { key:value } to an object
  @param key key
  @param value value
  @param ignoredKeys ignored keys
  @param object object