external notifications are now based on Events.

NzbDrone.Core/Download/EpisodeDownloadedEvent.cs

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+using System.Linq;
+using NzbDrone.Common.Eventing;
+using NzbDrone.Core.Model;
+
+namespace NzbDrone.Core.Download
+{
+    public class EpisodeDownloadedEvent : IEvent
+    {
+        public EpisodeParseResult ParseResult { get; private set; }
+
+        public EpisodeDownloadedEvent(EpisodeParseResult parseResult)
+        {
+            ParseResult = parseResult;
+        }
+    }
+}

NzbDrone.Core/Download/SeriesRenamedEvent.cs

@@ -0,0 +1,16 @@
+using System.Linq;
+using NzbDrone.Common.Eventing;
+using NzbDrone.Core.Tv;
+
+namespace NzbDrone.Core.Download
+{
+    public class SeriesRenamedEvent : IEvent
+    {
+        public Series Series { get; private set; }
+
+        public SeriesRenamedEvent(Series series)
+        {
+            Series = series;
+        }
+    }
+}