Merge branch '3.0' into 3.1

* 3.0: (25 commits)
  Fix merge
  [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
  [WebProfilerBundle] Fix invalid CSS style
  Added progressive jpeg to mime types guesser
  [Yaml] Fix wrong line number when comments are inserted in the middle of a block.
  Fixed singular of committee
  Do not inject web debug toolbar on attachments
  bumped Symfony version to 3.0.8
  updated VERSION for 3.0.7
  updated CHANGELOG for 3.0.7
  bumped Symfony version to 2.8.8
  updated VERSION for 2.8.7
  updated CHANGELOG for 2.8.7
  ...

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/PropertyAccess/StringUtil.php
	src/Symfony/Component/PropertyAccess/Tests/StringUtilTest.php
	src/Symfony/Component/Yaml/Parser.php
	src/Symfony/Component/Yaml/Tests/ParserTest.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 ?>