Newznab images handled in controller

Fixed: Missing Newznab Logos won't throw errors
#ND-127 fixed

NzbDrone.Web/Controllers/ImageController.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Web;
+using System.Web.Mvc;
+using NzbDrone.Common;
+
+namespace NzbDrone.Web.Controllers
+{
+    public class ImageController : Controller
+    {
+        private readonly DiskProvider _diskProvider;
+
+        public ImageController(DiskProvider diskProvider)
+        {
+            _diskProvider = diskProvider;
+        }
+
+        public ActionResult Newznab(string name)
+        {
+            var dir = Server.MapPath("/Content/Images/Indexers");
+            var path = Path.Combine(dir, String.Format("{0}.png", name));
+
+            if (_diskProvider.FileExists(path))
+                return File(path, "image/png");
+
+            return File(Path.Combine(dir, "Newznab.png"), "image/png");
+        }
+    }
+}