public InstantiatorFactory(IPackageRetriever packageRetriever)
 {
     _packageRetriever = packageRetriever;
     _rootPath         = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
                                      "ImpromptuPackages");
 }
 public InstantiatorFactory(IPackageRetriever packageRetriever, string rootPath)
 {
     _packageRetriever = packageRetriever;
     _rootPath         = rootPath;
 }