zquestz/omniauth-google-oauth2 — pull request #139 by pinglamb (2014-08-06 09:18:15+00:00)
Title: Updated prompt to approval_prompt

The Google OAuth2 doc shows that developers should use approval_prompt for indicating whether the user should be re-prompted for consent.

https://developers.google.com/accounts/docs/OAuth2WebServer#formingtheurl