code: function() {
                  var def = _promise.deferred();
  
                  _fs.exists(_folderPath, function(exists) {
                      if (exists) {
                          def.resolve();
                      } else {
                          _fs.mkdir(_folderPath, function(err) {
                              if (!err) {
                                  def.resolve();
                              } else {
                                  def.reject();
                              }
                          });
                      }
                  });
  
                  return def.promise();
              }
docs: /*
  Ensures that a physical copy of the folder exists at the path
  represented by this folder.