Upgrade to Angular 5

Identity Server 4 upgrade to Core 2 final (elanderson#19)

Changes need to deploy to Azure (elanderson#18)

Identity App to ASP.NET Core 2 (elanderson#16)

Add login via Twitter (elanderson#12)

Change Angular auth oidc clients (elanderson#10)

Add unauthorized page if route requires a logged in user (elanderson#7)

Calling Secured API from Angular

Log in/out from Angular (elanderson#5)

Using Entity Framework Core storage of configuration data