Added 'Fail' method to RunnableComponent which allows component to move from Running to Failed state. Added PollingComponent a timer based runnable component More tests Added FailPromise a thin class to wrap exceptions Fixed error handling in SuccessPromise classes.

using System;

namespace Implab {
    public interface IDeferred<in T> : ICancellationToken {
        void Resolve(T value);

        void Reject(Exception error);
    }
}