title: Add icons to link_to in js.erb.html?
body: <p>How can I add <code>&lt;i class="fa fa-heart-o"&gt;&lt;/i&gt;</code> to a <code>link_to</code> helper?</p>
  
  <pre><code>$('.like_song').bind('ajax:success', function(){
    $(this).parent().parent().find('.vote_count').html('&lt;%= escape_javascript @song.votes_for.size.to_s %&gt;');
    $(this).closest('.like_song').hide();
    $(this).closest('.votes').html(' &lt;%= link_to "Unfavorite", unlike_song_path(@song), remote: true, method: :get, class: 'unlike_song' %&gt;');
  });
  </code></pre>
  
  <p>What I'm trying to do is to create an icon (button) for favorite/unfavorite.</p>