Rails Bootstrap安裝

**GemFile內新增
gem 'bootstrap-sass'

**安裝
bundle install

**import bootstrap

**app/assets/stylesheets/application.css

@import "bootstrap-sprockets"; // 放 bootstrap 前

@import "bootstrap";

**修改副檔名成scss

app/assets/stylesheets/application.css

change to 

app/assets/stylesheets/application.scss

**加入javascript

**app/assets/javascripts/application.js

//= require jquery

//= require bootstrap-sprockets