title: how to use urlhelper to include rails 3 custom data- attribute
body: <p>I am using Rails 3 and found that if I add 
      :remote => :true, there will be added to the  tag the data-remote = true attribute. But I can't find a way to add custom data- attributes to the urlhelper. The followings won't work: </p>
  
  <pre><code>&lt;%= link_to projects_path, :history =&gt; "new"%&gt;
  &lt;%= link_to projects_path, :data-history =&gt; "new"%&gt; #this throws an error
  &lt;%= link_to projects_path, :data_history =&gt; "new"%&gt;
  </code></pre>
  
  <p>What I want to generate is:
      New Project</p>
  
  <p>anyone?</p>