Rails 3 and the gem devise_oauth2_providable cannot be installed

I am trying to setup an oAuth2 provider using the devise_oauth2_providable gem for devise. The installation instructions on the website is very lacking and I do not know how to setup a client for example.

Gem is found here: https://github.com/socialcast/devise_oauth2_providable

I need all pointers I can get! Than开发者_Go百科ks!

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Maybe it's too late but here is good example of the client and server: https://github.com/aganov/devise-oauth2-provider-client