Add additional optional fields to GoogleAuthorizationCodeRequestUrl

[GoogleCodeExporter]

External references, such as a standards document, or specification?
https://developers.google.com/accounts/docs/OpenIDConnect#authenticationuriparam
eters

Target platform (e.g. Windows, Mono, Silverlight, WP7, All)?
All

Please describe the feature requested.

Some of the optional parameters listed in 
https://developers.google.com/accounts/docs/OpenIDConnect#authenticationuriparam
eters are not included in the GoogleAuthorizationCodeRequestUrl class or base 
classes. Either they should be added or there should be a new class to help 
with the OpenID Connect authentication flow.

The missing parameters are:
- prompt (there is a approval_prompt parameter which has different name and 
list of options)
- display
- include_granted_parameters
- openid.realm
- hd

Original issue reported on code.google.com by awilli...@leveragepoint.com on 7 Jan 2015 at 4:12

[GoogleCodeExporter]

massive problem. how do you limit to users on your domain?

it was guess in previous incarnations, having to add the hd=my.domain parameter 
to the auth request, but now you cant even do that.

youve forced me into this with closing down DocumentsList services, and now we 
cant use the new thing properly. 

Original comment by alastair...@pegways.com on 19 Mar 2015 at 5:07