title: Rails 3 gem for capturing referrer info?
body: <p>Is there a single (or multiple) Rails gem that will help to easily capture the following on a when registering a new model instance (i.e.: new user)?</p>
  
  <ul>
  <li>referrer URL</li>
  <li>traffic source (google, bing, etc.)</li>
  <li>traffic medium (organic, cpc)</li>
  <li>search terms (if user came from a search engine)</li>
  </ul>
  
  <p>I know I could code this in manually, but no reason to recreate this if it's already done.</p>
  
  <p>The only thing I could find through searching is <a href="https://github.com/squeejee/search_sniffer" rel="nofollow">search_sniffer</a>, but that's a plugin, and I'd prefer to use a gem if available.</p>