FoursquareResourceOwner Fix

Foursquare support was broken. This one fixed it by disabling `use_bearer_authorization` so that 
`FoursquareResourceOwner::doGetUserInformationRequest` is actually used to retrieve user the information.

Also changed `authorization_url` to use `https://foursquare.com/oauth2/authenticate` as recommended in https://developer.foursquare.com/overview/auth.html
> /authenticate handles both user authentication and app authorization and automatically redirects if a user has already authorized the calling app. Conversely, /authorize will prompt the user to accept the the auth request every time.