zquestz/omniauth-google-oauth2 — pull request #141 by avokhmin (2014-08-13 16:57:15+00:00)
Title: Add approval_prompt option into authorize_options

According to [docs](https://developers.google.com/accounts/docs/OAuth2UserAgent)

> approval_prompt | force or auto | Indicates if the user should be re-prompted for consent. The default is auto, so a given user should only see the consent page for a given set of scopes the first time through the sequence. If the value is force, then the user sees a consent page even if they previously gave consent to your application for a given set of scopes.