added Nancy pipelines for error handling,

cleaned up container registrations.

NzbDrone.Api/ErrorManagment/ErrorHandler.cs

@@ -0,0 +1,33 @@
+using System.Linq;
+using Nancy;
+using Nancy.ErrorHandling;
+using NzbDrone.Api.QualityType;
+
+namespace NzbDrone.Api.ErrorManagment
+{
+    public class ErrorHandler : IStatusCodeHandler
+    {
+        public bool HandlesStatusCode(HttpStatusCode statusCode, NancyContext context)
+        {
+            return true;
+        }
+
+        public void Handle(HttpStatusCode statusCode, NancyContext context)
+        {
+            if (statusCode == HttpStatusCode.SeeOther || statusCode == HttpStatusCode.OK)
+                return;
+
+            if (statusCode == HttpStatusCode.Continue)
+            {
+                context.Response = new Response { StatusCode = statusCode };
+                return;
+            }
+
+            if (context.Response.ContentType == "text/html" || context.Response.ContentType == "text/plain")
+                context.Response = new ErrorModel
+                    {
+                            Message = statusCode.ToString()
+                    }.AsResponse(statusCode);
+        }
+    }
+}