Add extension method WebRequest.GetResponseAsync
Include necessary extensions from ParallelExtensionsExtras directly in the project since the ParallelExtensionsExtras package doesn't support .NET 3.5
Add InternalTaskExtensions with methods for returning completed tasks
Add utilities for implementing asynchronous providers to ProviderBase
Add the IProgress<T> interface for provider interface callbacks
Add the AsyncCompletionOption enumeration for specifying when tasks should be considered complete
Initial documentation page for asynchronous services