anchor.diff:  
       <div class="list-group list-group-bottom" data-toggle="collapse" data-target="#circle-code"><i class="fa fa-caret-right"></i> Circle</div>
       <pre id="circle-code" class="panel-collapse collapse"><code class="ruby">#Example code
  -class Circle < RTanque::Bot::Brain
  +class SampleCircle < RTanque::Bot::Brain
     def tick!
       make_circles
       command.fire 0.25
  
positive.code:   <div class="panel-heading" role="tab" data-toggle="collapse" data-target="#sample-code">Sample Bots</div>
    <div id="sample-code" class="panel-collapse collapse">
      <div class="list-group" data-toggle="collapse" data-target="#camper-code"><i class="fa fa-caret-right"></i> Camper</div>
      <pre id="camper-code" class="panel-collapse collapse"><code class="ruby"># Camper: Sample Bot
  #
  # Enjoys sitting in the corners and firing powerful shots
  class Camper < RTanque::Bot::Brain
  
negative.code:     <pre id="seek-and-destroy-code" class="panel-collapse collapse"><code class="ruby"># Seek&Destroy: Sample Bot
  #
  # Enjoys following and target and firing many shots
  class SampleSeekAndDestroy < RTanque::Bot::Brain
    TURRET_FIRE_RANGE = RTanque::Heading::ONE_DEGREE * 5.0
  
    def tick!
  