New: Add Subsonic library update and notify (#368)

* New: Add Subsonic library update and notify

* New: Subsonic setting for to allow connection via SSL

src/NzbDrone.Core/Notifications/Subsonic/SubsonicException.cs

@@ -0,0 +1,15 @@
+using NzbDrone.Common.Exceptions;
+
+namespace NzbDrone.Core.Notifications.Subsonic
+{
+    public class SubsonicException : NzbDroneException
+    {
+        public SubsonicException(string message) : base(message)
+        {
+        }
+
+        public SubsonicException(string message, params object[] args) : base(message, args)
+        {
+        }
+    }
+}