title: Spring bind in freemarker form not detected in the controller
body: <p>I have a form declared as follows:</p>
  
  <pre><code>  &lt;form id="reply-form-frm" novalidate="novalidate" action="/reply/responsive" method="POST"&gt;
                  [@spring.bind "model.form"/]
  
                  [@spring.bind "model.form.message" /]
  
                  &lt;label for="${spring.status.expression}" class="clearfix" data-error="Please enter a message"&gt;
                      &lt;span class="label-text"&gt;Your message&lt;/span&gt;
                      &lt;span class="set-right required-flag"&gt;Required&lt;/span&gt;
                  &lt;/label&gt;
  
                  &lt;p class="input-error[#if spring.status.errorMessages?size &gt; 0] reveal-error[#else] hide-error[/#if]"&gt;
                      [#if spring.status.errorMessages?size &gt; 0]
                        &lt;span&gt;[#list spring.status.errorMessages as error]${error}[/#list]&lt;/span&gt;
                      [/#if]
                  &lt;/p&gt;
                  [@spring.formTextarea "model.form.message", 'aria-required="true" required="required" data-clear="true"' /]
     &lt;/form&gt;
  </code></pre>
  
  <p>Some additional fields are rendered in the same way. The model the form receives is:</p>
  
  <pre><code>model: {
    form: {
      senderName: "hahahahaha",
      senderEmail: "asd@asd.es",
      advertId: 1000011793,
      optInMarketing: false,
      advertClickSource: "natural"
  }
  </code></pre>
  
  <p>And my controller has this mapping method:</p>
  
  <pre><code> public ModelAndView sendReplyResponsive(@ModelAttribute("model.form") ReplyForm replyForm,
                                              BindingResult bindingResult) {
      //TODO: content irrelevant ...
   }
  </code></pre>
  
  <p>The issue is that when the form renders, the elements map to "form.message" instead of "model.form.message" and my controller can't find the ReplyForm object on post.</p>
  
  <p>Any idea on how can I force Spring to use "model.form.message" as the name?</p>