Method rename

src/core/file_system.ts:107–107

* **Core**: Asynchronous rename. No arguments other than a possible exception * are given to the completion callback.

(oldPath: string, newPath: string, cb: BFSOneArgCallback)

   * are given to the completion callback.
   */
  rename(oldPath: string, newPath: string, cb: BFSOneArgCallback): void;
  /**
   * **Core**: Synchronous rename.
   */