Merge branch '3.3' into 3.4

* 3.3: (21 commits)
  [appveyor] disable memory limit on composer up
  Remove some unused variables and properties
  Remove some unused variables, properties and methods
  fix some edge cases with indented blocks
  [ExpressionLanguage] Fix parse error on 5.3
  [HttpKernel] remove noisy frame in controller stack traces
  [DI] Fix circular-aliases message
  [ExpressionLanguage] throw an SyntaxError instead of letting a undefined index notice
  Prevent a loop in aliases within the `findDefinition` method
  Fix php doc in Table class
  bumped Symfony version to 3.3.15
  updated VERSION for 3.3.14
  updated CHANGELOG for 3.3.14
  bumped Symfony version to 2.8.33
  updated VERSION for 2.8.32
  updated CHANGELOG for 2.8.32
  bumped Symfony version to 2.7.40
  updated VERSION for 2.7.39
  update CONTRIBUTORS for 2.7.39
  updated CHANGELOG for 2.7.39
  ...

Author: nicolas-grekas

Extension/Core/DataTransformer/DateIntervalToStringTransformer.php

@@ -23,20 +23,17 @@
 class DateIntervalToStringTransformer implements DataTransformerInterface
 {
     private $format;
-    private $parseSigned;
 
     /**
      * Transforms a \DateInterval instance to a string.
      *
      * @see \DateInterval::format() for supported formats
      *
-     * @param string $format      The date format
-     * @param bool   $parseSigned Whether to parse as a signed interval
+     * @param string $format The date format
      */
-    public function __construct($format = 'P%yY%mM%dDT%hH%iM%sS', $parseSigned = false)
+    public function __construct($format = 'P%yY%mM%dDT%hH%iM%sS')
     {
         $this->format = $format;
-        $this->parseSigned = $parseSigned;
     }
 
     /**