title: Bootstrap Scrollspy won't work with floated content (spanX)
body: <p>Scrollspy doesn't seem to work with the built in bootstrap "spanX" classes, for example:</p>
  
  <p><strong>This Works</strong></p>
  
  <pre><code> &lt;body data-spy="scroll" data-target="#scrollspy-nav"&gt;
       &lt;div id="scrollspy-nav" class="span4"&gt;
           &lt;ul class="nav nav-tabs nav-stacked affix"&gt;
               &lt;li&gt;&lt;a href="#test1"&gt;Section 1&lt;/a&gt;&lt;/li&gt;
               &lt;li&gt;&lt;a href="#test2"&gt;Section 2&lt;/a&gt;&lt;/li&gt;
               &lt;li&gt;&lt;a href="#test3"&gt;Section 3&lt;/a&gt;&lt;/li&gt;
           &lt;/ul&gt;
       &lt;/div&gt;
       &lt;div&gt;
           &lt;section id="test1"&gt;Test 1 &lt;!-- Lots of &lt;br/&gt;'s --&gt;&lt;/section&gt;
           &lt;section id="test2"&gt;Test 2 &lt;!-- Lots of &lt;br/&gt;'s --&gt;&lt;/section&gt;
           &lt;section id="test3"&gt;Test 3 &lt;!-- Lots of &lt;br/&gt;'s --&gt;&lt;/section&gt;
       &lt;/div&gt;
    &lt;/body&gt;
  </code></pre>
  
  <p><strong>This does not:</strong></p>
  
  <pre><code> &lt;body data-spy="scroll" data-target="#scrollspy-nav"&gt;
       &lt;div id="scrollspy-nav" class="span4"&gt;
           &lt;ul class="nav nav-tabs nav-stacked affix"&gt;
               &lt;li&gt;&lt;a href="#test1"&gt;Section 1&lt;/a&gt;&lt;/li&gt;
               &lt;li&gt;&lt;a href="#test2"&gt;Section 2&lt;/a&gt;&lt;/li&gt;
               &lt;li&gt;&lt;a href="#test3"&gt;Section 3&lt;/a&gt;&lt;/li&gt;
           &lt;/ul&gt;
       &lt;/div&gt;
       &lt;div class="span8"&gt;
           &lt;section id="test1"&gt;Test 1 &lt;!-- Lots of &lt;br/&gt;'s --&gt;&lt;/section&gt;
           &lt;section id="test2"&gt;Test 2 &lt;!-- Lots of &lt;br/&gt;'s --&gt;&lt;/section&gt;
           &lt;section id="test3"&gt;Test 3 &lt;!-- Lots of &lt;br/&gt;'s --&gt;&lt;/section&gt;
       &lt;/div&gt;
    &lt;/body&gt;
  </code></pre>
  
  <p>The first example (the one that works), does not have a spanX class on the content container div.</p>