title: columns inside bootstrap dropdown menu
body: <p>I'm attempting to turn the standard drop-down navbar menu from get bootstrap into a mega-menu. The menus will have different column amounts(5,5,4,4,3). Each column is a menu list. I tried just two ul lists with col-md-3, but its not working correctly, its making two distinct menus.</p>
  
  <p>codepen: <a href="http://codepen.io/iamgonge/pen/aJBaNg" rel="nofollow noreferrer">http://codepen.io/iamgonge/pen/aJBaNg</a></p>
  
  <p>Here is the dropdown code and the menus Id like to be in the mega menu</p>
  
  <pre><code> &lt;li class="active"&gt;&lt;a href="#"&gt;Link &lt;span class="sr-only"&gt;(current)&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
          &lt;li class="dropdown"&gt;
            &lt;a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"&gt;Dropdown &lt;span class="caret"&gt;&lt;/span&gt;&lt;/a&gt;
            &lt;ul class="col-md-3 dropdown-menu"&gt;
              &lt;li&gt;&lt;a href="#"&gt;Action&lt;/a&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Another action&lt;/a&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Something else here&lt;/a&gt;&lt;/li&gt;
              &lt;li role="separator" class="divider"&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Separated link&lt;/a&gt;&lt;/li&gt;
  
            &lt;/ul&gt;
  
             &lt;ul class="col-md-3 dropdown-menu"&gt;
              &lt;li&gt;&lt;a href="#"&gt;Action&lt;/a&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Another action&lt;/a&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Something else here&lt;/a&gt;&lt;/li&gt;
              &lt;li role="separator" class="divider"&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Separated link&lt;/a&gt;&lt;/li&gt;
            &lt;/ul&gt;
             &lt;ul class="col-md-3 dropdown-menu"&gt;
              &lt;li&gt;&lt;a href="#"&gt;Action&lt;/a&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Another action&lt;/a&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Something else here&lt;/a&gt;&lt;/li&gt;
              &lt;li role="separator" class="divider"&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href="#"&gt;Separated link&lt;/a&gt;&lt;/li&gt;
            &lt;/ul&gt;
          &lt;/li&gt;
  </code></pre>