Update to use Json.NET 5.0.6 and SimpleRESTServices 1.1.0.0

This update addresses the breaking changes in the SimpleRESTServices 1.1.0.0 release.

The only functional change specific to the openstack.net project is a bug fix in `GeographicalCloudIdentityProvider` where the `retryCount` value was being passed as a `retryDelay` argument (now the `retryDelay` value is passed).