Add notes to producer and remove build step for stats

Not sure about adding the stats to the project, and I am just using it as a
large data loader for testing.  But its convenient keeping it in the project.

Author: Jroland

src/kafka-net.sln

@@ -46,7 +46,6 @@ Global
 		{53E0B3CE-6C41-4C8A-8B66-9BD03667B1E0}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{53E0B3CE-6C41-4C8A-8B66-9BD03667B1E0}.Release|Any CPU.Build.0 = Release|Any CPU
 		{02E1B2E3-E1B2-4E68-9BD9-95F266302C75}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{02E1B2E3-E1B2-4E68-9BD9-95F266302C75}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{02E1B2E3-E1B2-4E68-9BD9-95F266302C75}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{02E1B2E3-E1B2-4E68-9BD9-95F266302C75}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection

src/kafka-net/Producer.cs

@@ -281,6 +281,7 @@ private async Task ProduceAndSendBatchAsync(List<TopicMessage> batchs, Cancellat
 
                     foreach (var task in sendTasks)
                     {
+                        //TODO when we dont ask for an ACK, result is an empty list.  Which FirstOrDefault returns null.  Dont like this...
                         task.MessagesSent.ForEach(x => x.Tcs.TrySetResult(task.Task.Result.FirstOrDefault()));
                     }
                 }