ExternalNotifications enabled (Xbmc only right now).

- Grab, Download, Rename
Notification Settings for Xbmc uses definitions.

NzbDrone.Core/Repository/ExternalNotificationDefinition.cs

@@ -0,0 +1,17 @@
+using PetaPoco;
+
+namespace NzbDrone.Core.Repository
+{
+    [TableName("ExternalNotificationDefinitions")]
+    [PrimaryKey("Id", autoIncrement = true)]
+    public class ExternalNotificationDefinition
+    {
+        public int Id { get; set; }
+
+        public bool Enable { get; set; }
+
+        public string ExternalNotificationProviderType { get; set; }
+
+        public string Name { get; set; }
+    }
+}