title: Bootstrap fill remaining columns
body: <p>Is there a bootstrap class that will fill however many columns have not already been taken?
  for example i have this div tag that might be there and it might not if it isnt i want the second div to take up 12 columns, but if it is there only take up 8 columns. like this</p>
  
  <pre><code>&lt;div class="row"&gt;
     &lt;?php if(something){ ?&gt;
        &lt;div class="col-md-4"&gt;
          &lt;div&gt; &lt;/div&gt;
        &lt;/div&gt;
     &lt;?php } ?&gt;
     &lt;div class="col-md-fill"&gt;
       &lt;div&gt; &lt;/div&gt;
     &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>other than using </p>
  
  <pre><code>&lt;div class="col-md-&lt;?php
       if($count &gt; 5){
           echo "8";
        } else {
           echo '12';
        }
         ?&gt;"&gt;
  </code></pre>