Fixes various issues relating to File Repositories and Services: U4-4014 FileRepositories offer no way to create folders, U4-4013 The models that the FileService produces causes security exceptions, U4-3993 Replace system.io calls in umbraco.scriptTasks legacy task

updates to latest CDF

src/Umbraco.Core/IO/IFileSystem.cs

@@ -5,6 +5,8 @@ using Umbraco.Core.CodeAnnotations;
 
 namespace Umbraco.Core.IO
 {
+    //TODO: There is no way to create a directory here without creating a file in a directory and then deleting it
+
 	public interface IFileSystem
     {
         IEnumerable<string> GetDirectories(string path);