Added :group option to paginate method

Ok, nothing really difficult, I add the possibility to call the paginate method with the :group option.

Please, someone can tell me how to submit this patch?

Thanks Sandro, sandro@railsonwave.com

Ok, nothing really difficult, I add the possibility to call the paginate method with the :group option.

Please, someone can tell me how to submit this patch?

Instructions: http://dev.rubyonrails.org/

//jarkko