anchor.diff:  <h2>Tag creation:</h2>
   <ul>
     <li>Tag created by <%= person_image(@tag.person) %><%= person_link(@tag.person) %> on <%= @tag.created_at %></li>
  -  <% if @tag.tagged_nodes.empty? %>
  +  <% if @tag.tagged_nodes.all.empty? %>
     <p>This tag has never been used.</p>
     <% else %>
     <li>First used <%= distance_of_time_in_words(Time.now, @tag.tagged_nodes.sort_by {|tm| tm.updated_at}[0].updated_at) -%> ago.</li>
  
positive.code: <% end %>
  
  <h2>Uses of this tag:</h2>
  <% if @tag.tagged_nodes.empty? %>
  <p>No models have ever been tagged with <%= @tag.name %>.</p>
  <% else %>
  <table>
  
negative.code: 
  <h2>People who have used this tag:</h2>
  <ul>
    <% if @tag.tagged_nodes.all.empty? %>
    <p>No people have ever tagged models with <%= @tag.name %>.</p>
    <% else %>
    <% @tag.tagged_nodes.map {|tm| tm.person}.uniq.sort_by {|p| "#{p.last_name} #{p.first_name}" }.each do |person| %>
  