AspNetCore Hosting 0.4.0

AspNetCore 0.4.0

 *   Copies "All" attributes to endpoint metadata      
     * Some attributes sucha as Validation, Authorization and other attributes specific to OpenRiaServices are not copied
 * `AddDomainService()` methods inside `MapOpenRiaServices` now returns `IEndpointConventionBuilder` allowing conventions to be specified per `DomainService`
    ```C#
    app.MapOpenRiaServices(builder =>
    {
        builder.AddDomainService<Cities.CityDomainService>()
            .WithGroupName("Cities");
    });
    ```
 * Updated README.md and added Sample project
 * Make it compatible with more middleware such as OutputCache middleware by "Completing" responses
 * CHANGES:
    * `services.AddOpenRiaServices<T>()` now requires T to derive from DomainServce
    * `services.AddOpenRiaServices<T>()` has different return type

What's Changed

• AspNetCore: Fix OutputCache middleware support and update README by @Daniel-Svensson in #426

Full Changelog: v5.4.0-preview.1...aspnetcore-0.4.0