added Safe.DispatchEvent() a legacy equivalent for '?.Invoke()' added Safe.Dispose(IEnumerable) added PromiseExtensions.CancellationPoint to add a cancellation point to the chain of promises added IPromise<T> PromiseExtensions.Then<T>(this IPromise<T> that, Action<T> success) overloads added PromiseExtensions.Error() overloads to handle a error or(and) a cancellation

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Implab
{
    public interface IProgressNotifier
    {
        event EventHandler<ValueEventArgs<string>> MessageUpdated;
        event EventHandler<ValueEventArgs<float>> ProgressUpdated;
        event EventHandler<ProgressInitEventArgs> ProgressInit;
    }
}