Incorporate Foursquare native auth

[octopi]

Foursquare recently launched native auth for iOS and it is now the preferred way to authenticate on iOS.

Would love to see this make it into this library or at least the sample app!

[baztokyo]

We have tested foursquare-ios-oauth.

https://github.com/foursquare/foursquare-ios-oauth

However, unfortunately, it does not work properly at present:

“foursquare OAuth: Invalid version (20130509)”

We have the plan to implement this feature after the API is stable.

[octopi]

Did you test using the latest version of the Foursquare app? Older versions of the app don't support native auth.

[baztokyo]

Thanks. It will be supported by the major update.

[Ge0rges]

is this supported yet