destroy(label) {
    process.chdir(this.rootPath);
    quickTemp.remove(this.dirs, label);
    process.chdir(originalWorkingDirectory);

    this._conf.delete(label);
  }
The `destroy` method removes all evidence of the package cache.

@method destroy
@param {String} label The label for the cache.
@param {String} type The type of package cache.