How to use Bootstrap 3 RC with Rails 4

I'm trying to migrate from Bootstrap 2, to version 3 RC1 in a Rails 4 project. Initially I used bootstrap-sass gem 2.3.2 and everything worked smoothly. How can i add Boostrap 3 to my project now? I can't find any gem already converted to SASS and the official documentation tells to compile it into CSS from LESS. I'm fairly new to all of this so i'm really getting confused here, any help? UPDATE S

[simar]

rails4(sass)でbootstrap3(rc)を使うには。