Update to Drupal 8.0.0 beta 14. For more information, see https://drupal.org/node/2544542

sites/default/default.services.yml

@@ -82,8 +82,8 @@ parameters:
     # The Renderer will automatically associate these cache contexts with every
     # render array, hence varying every render array by these cache contexts.
     #
-    # @default ['languages:language_interface', 'theme']
-    required_cache_contexts: ['languages:language_interface', 'theme']
+    # @default ['languages:language_interface', 'theme', 'user.permissions']
+    required_cache_contexts: ['languages:language_interface', 'theme', 'user.permissions']
   factory.keyvalue:
     {}
     # Default key/value storage service to use.
@@ -96,3 +96,18 @@ parameters:
     # Default key/value expirable storage service to use.
     # @default keyvalue.database.expirable
     # default: keyvalue.database.expirable
+  # Allowed protocols for URL generation.
+  filter_protocols:
+    - http
+    - https
+    - ftp
+    - news
+    - nntp
+    - tel
+    - telnet
+    - mailto
+    - irc
+    - ssh
+    - sftp
+    - webcal
+    - rtsp

sites/default/default.settings.php

@@ -632,6 +632,15 @@ if ($settings['hash_salt']) {
  */
 $settings['container_yamls'][] = __DIR__ . '/services.yml';
 
+/**
+ * Override the default service container class.
+ *
+ * This is useful for example to trace the service container for performance
+ * tracking purposes, for testing a service container with an error condition or
+ * to test a service container that throws an exception.
+ */
+# $settings['container_base_class'] = '\Drupal\Core\DependencyInjection\Container';
+
 /**
  * Trusted host configuration.
  *

sites/example.settings.local.php

@@ -11,6 +11,24 @@
  * mention 'settings.local.php'.
  */
 
+/**
+ * Assertions.
+ *
+ * The Drupal project primarily uses runtime assertions to enforce the
+ * expectations of the API by failing when incorrect calls are made by code
+ * under development.
+ *
+ * @see http://php.net/assert
+ * @see https://www.drupal.org/node/2492225
+ *
+ * If you are using PHP 7.0 it is strongly recommended that you set
+ * zend.assertions=1 in the PHP.ini file (It cannot be changed from .htaccess
+ * or runtime) on development machines and to 0 in production.
+ *
+ * @see https://wiki.php.net/rfc/expectations
+ */
+assert_options(ASSERT_ACTIVE, 1);
+
 /**
  * Enable local development services.
  */
@@ -18,6 +36,9 @@ $settings['container_yamls'][] = DRUPAL_ROOT . '/sites/development.services.yml'
 
 /**
  * Show all error messages, with backtrace information.
+ *
+ * In case the error level could not be fetched from the database, as for
+ * example the database connection failed, we rely only on this value.
  */
 $config['system.logging']['error_level'] = 'verbose';