code: function ExplorerModel(rootPath, /* function returning promise */fetchItems, idPrefix) {
  		this.rootPath = rootPath;
  		this.fetchItems = fetchItems;
  		this.idPrefix = idPrefix || "";
  	}
docs: Creates a new explorer model instance.
  @name orion.explorer.ExplorerModel
  @class Simple tree model using Children and ChildrenLocation attributes to fetch children
  and calculating id based on Location attribute.