title: use nokogiri 1.5.9 with rails
body: <p>I want to use Ruby 1.8.7 with Rails, but when I run <code>bundle install</code> I get this error:</p>
  
  <pre><code>Gem::InstallError: nokogiri requires Ruby version &gt;= 1.9.2.
  An error occurred while installing nokogiri (1.6.0), and Bundler cannot continue.
  Make sure that `gem install nokogiri -v '1.6.0'` succeeds before bundling.     
  </code></pre>
  
  <p>nokogiri 1.6.0 does not support Ruby &lt;1.9.2.</p>
  
  <p>I tried installing nokogiri 1.5.9 to make things work but it did not help.</p>