title: Why do you need "require 'bundler/setup'"?
body: <p>In almost every Sinatra example I've seen, despite what it does, it always has the following two lines:</p>
  
  <pre><code>require 'rubygems'
  require 'bundler/setup'
  </code></pre>
  
  <p>In most examples, removing the 'bundler/setup' require seems to have no breaking effect, so I'm confused about when/where I need to include this.</p>
  
  <p>I hate using things without knowing exactly the reason for it being there, so I was hoping someone could explain why I need both lines and what they do?</p>