[openstreetmap-website] Google OAuth support (#918)

[Tom Hughes]

This replaces our existing OpenID based support for logging in with Google with an OAuth based approach, which will resolve #897 and deal with the forthcoming remove of OpenID support by Google.

It's not ready for merging quite yet because it requires a small patch to the `omniauth-google-oauth2` gem to support transparent upgrading of OpenID logins to OAuth logins.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/918

-- Commit Summary --

  * Add support for Google OAuth2 authentication
  * Add tests for Google OAuth authentication

-- File Changes --

    M Gemfile (1)
    M Gemfile.lock (13)
    M app/controllers/user_controller.rb (23)
    M app/helpers/user_helper.rb (2)
    M app/views/user/account.html.erb (2)
    M app/views/user/login.html.erb (4)
    M app/views/user/new.html.erb (2)
    M config/example.application.yml (8)
    M config/initializers/omniauth.rb (10)
    A lib/auth.rb (4)
    M test/fixtures/users.yml (20)
    M test/integration/user_creation_test.rb (118)
    M test/integration/user_login_test.rb (139)
    M test/models/user_test.rb (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/918.patch
https://github.com/openstreetmap/openstreetmap-website/pull/918.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/918
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