Update Google authentication method

[rosy1280]

Attempts to log in to jobs.code4lib.org fail and users are redirected here: https://support.google.com/accounts/answer/6206245?p=openid&rd=1. According to that page, OpenID 2.0 was replaced by OpenID Connect. The page also links to instructions on migrating from OpenID 2.0; those instructions can be found here: https://developers.google.com/identity/protocols/OpenID2Migration

[edsu]

I suspect that an upgrade of django-socialauth will fix this. I need to find the time to test it in a dev environment first though.

[tfmorris]

Since django-socialauth is deprecated, you might consider taking the opportunity to migrate to https://github.com/omab/python-social-auth

[edsu]

:+1: