title: Rails 3.1. Cocoon link_to_add_association example needed
body: <p>pls show any example of using Cocoon's 'link_to_add_association' with html_options.
  <a href="https://github.com/nathanvda/cocoon" rel="nofollow">https://github.com/nathanvda/cocoon</a></p>
  
  <p>Documentation says:</p>
  
  <pre><code>html_options: extra html-options (see link_to) There are two extra options that allow to conrol the placement of the new link-data:
  
      data-association-insertion-node : the jquery selector of the node
      data-association-insertion-position : insert the new data before or after the given node.
  </code></pre>
  
  <p>But i can not understand what to do, if i want insert partial just before my "add element" link. Not just after parent's div begin. This not gonna work:</p>
  
  <blockquote>
    <p>&lt;%= link_to_add_association "add element", f, :production_years,
    :position => "after_all" %></p>
  </blockquote>