Updated to Beta3-2. Changed JWT to BearerTokenAuthentication

In MVC Authentication project:

Updated Thinktecture.IdentityServer.V3 and Thinktecture.IdentityServer.V3.AccessTokenValidation nugets to Beta3-2. 

Updated API project Startup.cs Configuration to new BearerToken format.

            app.UseIdentityServerJwt(new JwtTokenValidationOptions
                {
                    Authority = "https://localhost:44319/identity"
                });

to

            app.UseIdentityServerBearerTokenAuthentication(new IdentityServerBearerTokenAuthenticationOptions
            {
                Authority = "https://localhost:44319/identity"
            });

BugNumber #31