Merge branch '3.1' into 3.2

* 3.1:
  do not depend on a fixed date in layout tests
  [Console] Escape default value when dumping help
  [Console] OS X Can't call cli_set_process_title php without superuser
  Fixed @return when returning this or static #bis
  fixed @return when returning this or static
  Polish translation improvement in Validator component
  [Console] Descriptors should use Helper::strlen
  [Config] Improve PHPdoc / IDE autocomplete
  [Debug] Wrap call to ->log in a try catch block
  [Debug] UndefinedMethodFatalErrorHandler - Handle anonymous classes
  fix merge
  [cache] Bump RedisAdapter timeout to 5s
  fixed @return when returning this or static
  [SecurityBundle] Made collection of user provider unique when injecting them to the RemberMeService
  remove is_writable check on filesystem cache

Author: nicolas-grekas

Definition/Builder/ExprBuilder.php

@@ -210,7 +210,7 @@ public function thenUnset()
     /**
      * Returns the related node.
      *
-     * @return NodeDefinition
+     * @return NodeDefinition|ArrayNodeDefinition|VariableNodeDefinition
      *
      * @throws \RuntimeException
      */

Definition/Builder/MergeBuilder.php

@@ -63,7 +63,7 @@ public function denyOverwrite($deny = true)
     /**
      * Returns the related node.
      *
-     * @return NodeDefinition
+     * @return NodeDefinition|ArrayNodeDefinition|VariableNodeDefinition
      */
     public function end()
     {

Definition/Builder/NodeDefinition.php

@@ -107,7 +107,7 @@ public function attribute($key, $value)
     /**
      * Returns the parent node.
      *
-     * @return NodeParentInterface|NodeBuilder|NodeDefinition|null The builder of the parent node
+     * @return NodeParentInterface|NodeBuilder|NodeDefinition|ArrayNodeDefinition|VariableNodeDefinition|null The builder of the parent node
      */
     public function end()
     {

Definition/Builder/ValidationBuilder.php

@@ -36,7 +36,7 @@ public function __construct(NodeDefinition $node)
      *
      * @param \Closure $closure
      *
-     * @return ExprBuilder|ValidationBuilder
+     * @return ExprBuilder|$this
      */
     public function rule(\Closure $closure = null)
     {