I have the following entries my (Rails 3.2.13) Gemfile:
gem \'twitter-bootstrap-rails\'
gem \'bootstrap-sass\'
and in app/assets/javascripts/ap
No you do not need both.
Just simply put this in your gemfile:
gem 'sass-rails'
gem 'bootstrap-sass'
This in application.css.scss:
@import 'bootstrap';
@import 'bootstrap-responsive';
This in application.js
//= require bootstrap
If you're still having problems you may need to look at the ordering of things in your manifest files..