title: auth/google_oauth2 not working on rails app
body: <p>I was able to make an authentication using Facebook and wanted to try Google for my rails app but after installing the gem omniauth-google-oauth2 and giving the proper code to the omniauth.rb I can´t make it work to the url /auth/google_oauth2</p>
  
  <p>Here is my code:</p>
  
  <pre><code>    OmniAuth.config.logger = Rails.logger
  
      Rails.application.config.middleware.use OmniAuth::Builder do
       provider :facebook, ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_SECRET'],
       :scope =&gt; 'email', :display =&gt; 'popup'
       provider :google_oauth2, ENV["GOOGLE_CLIENT_ID"], ENV["GOOGLE_CLIENT_SECRET"], 
       {
           :name =&gt; "google",
           :scope =&gt; "email, profile, plus.me, http://gdata.youtube.com",
           :prompt =&gt; "select_account",
           :image_aspect_ratio =&gt; "square",
           :image_size =&gt; 50
       }
  
  
  end
  </code></pre>
  
  <p>After i run the <code>bundle install</code>command and try to go to /auth/google_oauth2 I get the error <code>No route matches [GET] "/auth/google_oauth2"</code>.
  I followed the instructions of the gem and also I did not need to set a route for the /auth/facebook method.</p>
  
  <p>Is there anything I'm doing wrong?</p>