Add Gmail authentication

I am a rails developer.I installed redmine 2.3.1 in my localhost.

I need to add gmail authentication to my Redmine application.

I added https://github.com/mconf/redmine_openid_selector this plugin and run rake redmine:plugins:migrate RAILS_ENV=development

It installed the plugin but I did not see the authentication as such at http://projects.jorgebg.com/login

Please help me in this case

Thanks in advance.

I think its best you contact the author of that plugin.
That said, there's #11357... and have you read this, perhaps it helps...

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