Added NMA support, also added generic HttpStatusCode handling

NzbDrone.Core/Exceptions/StatusCodeToExceptions.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+
+namespace NzbDrone.Core.Exceptions
+{
+    public static class StatusCodeToExceptions
+    {
+        public static void VerifyStatusCode(this HttpStatusCode statusCode, string message = null)
+        {
+            if (String.IsNullOrEmpty(message))
+            {
+                message = statusCode.ToString();
+            }
+
+            switch (statusCode)
+            {
+                case HttpStatusCode.BadRequest:
+                    throw new BadRequestException(statusCode, message);
+
+                case HttpStatusCode.Unauthorized:
+                    throw new UnauthorizedAccessException(message);
+
+                case HttpStatusCode.PaymentRequired:
+                    throw new DownstreamException(statusCode, message);
+
+                case HttpStatusCode.InternalServerError:
+                    throw new DownstreamException(statusCode, message);
+            }
+        }
+    }
+}