title: Yii 2.0 How to generate form without <div class="form-group">?
body: <pre><code>&lt;?php $form = ActiveForm::begin(['id' =&gt; 'contact-form']); ?&gt;
          &lt;?= $form-&gt;field($model, 'email',  [
                  'inputOptions' =&gt; [ 'placeholder' =&gt; 'Ihre E-Mail Adresse', 'class' =&gt; 'newsletter-cta-mail' ]
          ])-&gt;label(false)-&gt;textInput(); ?&gt;
          &lt;?= Html::submitButton('20€ Gutschein sichern', ['class' =&gt; 'green newsletter-cta-button', 'name' =&gt; 'contact-button', 'value' =&gt; 'hallo']) ?&gt;
  &lt;?php ActiveForm::end(); ?&gt;
  </code></pre>
  
  <p>results into:</p>
  
  <pre><code>&lt;form id="contact-form" action="/" method="post" role="form"&gt;
  &lt;input type="hidden" name="_csrf" value="WFlFWnIwU1Y3HnQKSn06GG46PXcjQRUzNCA9KhRiYCxvFXQ9RHIiPA=="&gt;     &lt;div class="form-group field-newsletterform-email required has-error"&gt;
  
  &lt;input type="text" id="newsletterform-email" class="newsletter-cta-mail" name="NewsletterForm[email]" placeholder="Ihre E-Mail Adresse"&gt;
  
  &lt;p class="help-block help-block-error"&gt;Verification Code cannot be blank.&lt;/p&gt;
  &lt;/div&gt;  &lt;button type="submit" class="green newsletter-cta-button" name="contact-button" value="hallo"&gt;20€ Gutschein sichern&lt;/button&gt;&lt;/form&gt;
  </code></pre>
  
  <p>But I dont need the wrapping 
  
  <p>How to disable this? </p>