Modifying Nancy.Serializers.JsonNet to support customization through either auto-discovery or explicit settings

gistfile1.cs

        public static JsonSerializer Serializer;

        public JsonNetSerializer()
        {
            Serializer = GetJsonSerializer();
        }

        private static JsonSerializer GetJsonSerializer()
        {
            if (Serializer != null)
            {
                return Serializer;
            }

            var serializerType = AppDomainAssemblyTypeScanner
                .Types
                .Where(x => x != typeof(JsonSerializer)).SingleOrDefault(x => (typeof(JsonSerializer).IsAssignableFrom(x)));

            return (serializerType != null) ? (JsonSerializer)Activator.CreateInstance(serializerType) : new JsonSerializer();
        }