Merge branch '2.7' into 2.8

* 2.7:
  [ci] Get ICU/intl from github instead of nebm.ist.utl.pt/~glopes
  [Debug] Fix case sensitivity checks
  [Debug] Fix handling of php7 throwables
  fix high deps tests
  [Process] remove dead code
  [WebProfilerBundle] Add missing use statement.
  [ClassLoader] Fix storing not-found classes in APC cache
  [Form] cs fixes in date types
  [phpunit] disable prophecy

Author: fabpot

Resources/views/Form/widget_attributes.html.php

@@ -2,7 +2,7 @@
 <?php if ($disabled): ?> disabled="disabled"<?php endif ?>
 <?php if ($required): ?> required="required"<?php endif ?>
 <?php foreach ($attr as $k => $v): ?>
-<?php if ('readonly' === $k) { continue; } ?>
+<?php if ('readonly' === $k && $read_only): continue; endif ?>
 <?php if (in_array($k, array('placeholder', 'title'), true)): ?>
 <?php printf(' %s="%s"', $view->escape($k), $view->escape(false !== $translation_domain ? $view['translator']->trans($v, array(), $translation_domain) : $v)) ?>
 <?php elseif ($v === true): ?>