title: When do you need a require in a rails Gemfile?
body: <p>In my gemfile I have things like:</p>
  
  <pre><code>gem 'net-sftp', '2.1.1', :require =&gt; 'net/sftp'
  gem 'backup', '3.0.27'
  gem 'watu_table_builder', :require =&gt; 'table_builder'
  gem 'browser', '0.1.6'
  </code></pre>
  
  <p>When in a Gemfile do you need a require? I've also found things like <code>:require =&gt; false</code>. Help?</p>