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/SubsonicAuthenticationException.cs

@@ -0,0 +1,14 @@
+namespace NzbDrone.Core.Notifications.Subsonic
+{
+    public class SubsonicAuthenticationException : SubsonicException
+    {
+        public SubsonicAuthenticationException(string message) : base(message)
+        {
+        }
+
+        public SubsonicAuthenticationException(string message, params object[] args)
+            : base(message, args)
+        {
+        }
+    }
+}