WIP booking

* CalAuth.aspx: A view ... still unused

* style.css: css overflow-y auto, the container making it modal has no
  margin.

* GoogleController.cs: Fixes again the calendar usage,
uses Google API key and client credentials found in configuration file

* ApiClient.cs: Google API key and client credentials are now found in
  configuration file

* CalendarApi.cs: Let the controller build the credential string from
  thr profile object.

* OAuth2.cs: The OAuth2 Client only needs a client id and secret

* yavsc.js: Fixes some css flipping

* ValidateAjaxAttribute.cs: A FIXME

* Web.config: Google key, client id and secret come from application
  settings

* Web.csproj: a page in more

* YavscModel.csproj:
* PostInfoByUser.cs:
* PostInfoByTitle.cs:
* BlogEntryCollection.cs: refactoring

web/ValidateAjaxAttribute.cs

@@ -43,7 +43,7 @@ namespace Yavsc
 					where modelState[x].Errors.Count > 0
 				select new
 			{
-				// FIXME why?
+				// FIXME why not directly underscores?
 				key = x.Replace(".","_"),
 				errors = modelState[x].Errors.
 					Select(y => y.ErrorMessage).