title: What does //= require mean?
body: <p>What does the "//= require bootstrap/affix" in <a href="https://github.com/twbs/bootstrap-sass/blob/master/vendor/assets/javascripts/bootstrap.js" rel="nofollow" title="bootstrap">this .js code</a> mean?</p>
  
  <pre><code>//= require bootstrap/affix
  //= require bootstrap/alert
  //= require bootstrap/button
  //= require bootstrap/carousel
  //= require bootstrap/collapse
  //= require bootstrap/dropdown
  //= require bootstrap/tab
  //= require bootstrap/transition
  //= require bootstrap/scrollspy
  //= require bootstrap/modal
  //= require bootstrap/tooltip
  //= require bootstrap/popover
  </code></pre>