title: Rails: Uninstall specific version of a library using gem
body: <p>For example I have the following four versions installed:</p>
  
  <blockquote>
    <p>capybara (2.2.1, 2.2.0.rc1, 2.1.0, 1.1.4)</p>
  </blockquote>
  
  <p>Please suggest how to uninstall the <strong>capybara version 1.1.4</strong></p>