Adding support for piping task result to actor as a single message

AkkaTaskExtensions.cs

	public class TaskResult<T> {
		public bool IsFailed { get; }
		public T Result { get; }
		public Exception Exception { get; }

		public TaskResult(bool isFailed, T result, Exception ex) {
			IsFailed = isFailed;
			Result = result;
			Exception = ex;
		}

		public static TaskResult<T> Success(T result) {
			return new TaskResult<T>(false, result, null);
		}

		public static TaskResult<T> Failure(Exception ex) {
			return new TaskResult<T>(true, default(T), ex);
		}
	}

	public static class TaskExtensions {
		public static void PipeResultTo<T>(this Task<object> taskToPipe, ICanTell recipient) {
			taskToPipe.ContinueWith(tresult => {
				TaskResult<T> message;

				if (tresult.IsCanceled || tresult.IsFaulted) {
					message = TaskResult<T>.Failure(tresult.Exception);
				}
				else {
					if (tresult.Result is T) {
						message = TaskResult<T>.Success((T) tresult.Result);
					}
					else {
						message = TaskResult<T>.Failure(new Exception("Invalid type returned: " + tresult.GetType()));
					}
				}
				recipient.Tell(message, ActorRefs.NoSender);
			}, CancellationToken.None, TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
		}
	}