Fixed: Not uploading nzbs to Nzbget on linux since previous develop.

src/NzbDrone.Common/Http/Dispatchers/CurlHttpDispatcher.cs

@@ -43,7 +43,9 @@ namespace NzbDrone.Common.Http.Dispatchers
 
             if (request.NetworkCredential != null)
             {
-                throw new NotImplementedException("Credentials not supported for curl dispatcher.");
+                var authInfo = request.NetworkCredential.UserName + ":" + request.NetworkCredential.Password;
+                authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
+                request.Headers["Authorization"] = "Basic " + authInfo;
             }
 
             lock (CurlGlobalHandle.Instance)

src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs

@@ -23,6 +23,11 @@ namespace NzbDrone.Common.Http.Dispatchers
             webRequest.ContentLength = 0;
             webRequest.CookieContainer = cookies;
 
+            if (request.NetworkCredential != null)
+            {
+                webRequest.PreAuthenticate = true;
+            }
+
             if (request.RequestTimeout != TimeSpan.Zero)
             {
                 webRequest.Timeout = (int)Math.Ceiling(request.RequestTimeout.TotalMilliseconds);