title: zf2 form collection don't show element description
body: <p>When the collection element is rendered , description element does not appear.
  ZF2 seems to ignore the description option in the form collection.</p>
  
  <p><strong>Form</strong></p>
  
  <pre><code>$this-&gt;add(array(
          'type' =&gt; 'Zend\Form\Element\Collection',
          'name' =&gt; 'value',
          'options' =&gt; array(
              'label' =&gt; 'Please choose value',
              'count' =&gt; 1,
              'should_create_template' =&gt; true,
              'target_element' =&gt; new ValueFieldset($objectManager)
          )
      ));
  </code></pre>
  
  <p><strong>Form Fieldset:</strong> ValueFieldset</p>
  
  <pre><code>$this-&gt;add(array(
                  'name' =&gt; 'name',
                  'type' =&gt; 'Zend\Form\Element\Text',
                  'options' =&gt; array(
                      'label' =&gt; 'Values',
                      'label_attributes' =&gt; array(
                          'class' =&gt; 'form-label'
                      ),
                      'description' =&gt; '&lt;a href="#" class="remove-value"&gt;X&lt;/a&gt;', 
                      'multiple' =&gt; true,
                    ),
  
              )
      );
  </code></pre>
  
  <p>View</p>
  
  <pre><code>echo $this-&gt;formCollection($values);
  </code></pre>