added Nancy pipelines for error handling,

cleaned up container registrations.

NzbDrone.Api/ErrorManagment/ErrorModel.cs

@@ -0,0 +1,21 @@
+using System.Linq;
+
+namespace NzbDrone.Api.ErrorManagment
+{
+    public class ErrorModel
+    {
+        public string Message { get; set; }
+        public string Description { get; set; }
+        public object Content { get; set; }
+
+        public ErrorModel(ApiException exception)
+        {
+            Message = exception.Message;
+            Content = exception.Content;
+        }
+
+        public ErrorModel()
+        {
+        }
+    }
+}