merged branch agiuliano/master (PR #547)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #547).

Discussion
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Fix deprecated function

In AcmeDemoController/contactAction there was the deprecated function $form->bind() instead of $form->submit()

Commits
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b83f3ba Fix deprecated function bind

Author: fabpot

src/Acme/DemoBundle/Controller/DemoController.php

@@ -40,7 +40,7 @@ public function contactAction()
 
         $request = $this->get('request');
         if ($request->isMethod('POST')) {
-            $form->bind($request);
+            $form->submit($request);
             if ($form->isValid()) {
                 $mailer = $this->get('mailer');
                 // .. setup a message and send it