Episode import improvements

Fixed: Use folder name when file name is not parsable on import

src/NzbDrone.Common/Extensions/ObjectExtensions.cs

@@ -0,0 +1,13 @@
+using NzbDrone.Common.Serializer;
+
+namespace NzbDrone.Common.Extensions
+{
+    public static class ObjectExtensions
+    {
+        public static T JsonClone<T>(this T source) where T : new()
+        {
+            var json = source.ToJson();
+            return Json.Deserialize<T>(json);
+        }
+    }
+}