Method rename

src/core/file_system.ts:803–810

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

  }

  public rename(oldPath: string, newPath: string, cb: BFSOneArgCallback): void {
    try {
      this.renameSync(oldPath, newPath);
      cb();
    } catch (e) {
      cb(e);
    }
  }

  public stat(p: string, isLstat: boolean | null, cb: BFSCallback<Stats>): void {
    try {