Merge branch '2.7' into 2.8

* 2.7:
  [HttpFoundation] Use UPSERT for sessions stored in PgSql >= 9.5
  [Console] fixed PHPDoc
  [travis] HHVM 3.12 LTS
  Fix feature detection for IE
  [Form] Fixed collapsed choice attributes
  [Console] added explanation of messages usage in a progress bar
  force enabling the external XML entity loaders
  [Yaml] properly count skipped comment lines

Conflicts:
	src/Symfony/Component/Translation/Loader/XliffFileLoader.php

Author: nicolas-grekas

Resources/views/Form/choice_attributes.html.php

@@ -0,0 +1,9 @@
+id="<?php echo $view->escape($id) ?>" name="<?php echo $view->escape($full_name) ?>"
+<?php if ($disabled): ?>disabled="disabled" <?php endif ?>
+<?php foreach ($choice_attr as $k => $v): ?>
+<?php if ($v === true): ?>
+<?php printf('%s="%s" ', $view->escape($k), $view->escape($k)) ?>
+<?php elseif ($v !== false): ?>
+<?php printf('%s="%s" ', $view->escape($k), $view->escape($v)) ?>
+<?php endif ?>
+<?php endforeach ?>

Resources/views/Form/choice_widget_options.html.php

@@ -8,6 +8,6 @@
             <?php echo $formHelper->block($form, 'choice_widget_options', array('choices' => $choice)) ?>
         </optgroup>
     <?php else: ?>
-        <option value="<?php echo $view->escape($choice->value) ?>" <?php echo $view['form']->block($form, 'attributes', array('attr' => $choice->attr)) ?><?php if ($is_selected($choice->value, $value)): ?> selected="selected"<?php endif?>><?php echo $view->escape(false !== $choice_translation_domain ? $translatorHelper->trans($choice->label, array(), $choice_translation_domain) : $choice->label) ?></option>
+        <option value="<?php echo $view->escape($choice->value) ?>" <?php echo $formHelper->block($form, 'choice_attributes', array('choice_attr' => $choice->attr)) ?><?php if ($is_selected($choice->value, $value)): ?> selected="selected"<?php endif?>><?php echo $view->escape(false !== $choice_translation_domain ? $translatorHelper->trans($choice->label, array(), $choice_translation_domain) : $choice->label) ?></option>
     <?php endif ?>
 <?php endforeach ?>