Log Goodreads connection failures with more info.

(cherry picked from commit 6672650b6b5e152e82fb3ad38a0a158d66c0b83d)

src/NzbDrone.Core/MetadataSource/BookInfo/BookInfoException.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Net;
 using NzbDrone.Core.Exceptions;
 
@@ -14,5 +15,10 @@ namespace NzbDrone.Core.MetadataSource.BookInfo
             : base(HttpStatusCode.ServiceUnavailable, message, args)
         {
         }
+
+        public BookInfoException(string message, Exception innerException, params object[] args)
+            : base(HttpStatusCode.ServiceUnavailable, message, innerException, args)
+        {
+        }
     }
 }