`token_auth` was removed from devise, see http://blog.plataformatec.com.br/2013/08/devise-3-1-now-with-more-secure-defaults/ (section "Token Authenticatable").

Our current implementation does the same thing by passing `store: false` when signing in user:

https://github.com/fs/rails3-base-api/blob/rails4/app/controllers/application_controller.rb#L22

```ruby
user_token = params[:authentication_token].presence
user = user_token && User.where(authentication_token: user_token).first

if user
  sign_in user, store: false
end
```