Merge branch '2.7' into 2.8

* 2.7:
  Remove some unused variables, properties and methods
  [ExpressionLanguage] Fix parse error on 5.3
  [HttpKernel] remove noisy frame in controller stack traces
  [ExpressionLanguage] throw an SyntaxError instead of letting a undefined index notice
  Fix php doc in Table class
  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

Templating/Helper/AssetsHelper.php

@@ -43,7 +43,7 @@ public function __construct(Packages $packages)
     public function getUrl($path, $packageName = null, $version = null)
     {
         // BC layer to be removed in 3.0
-        if (3 === $count = func_num_args()) {
+        if (3 === func_num_args()) {
             @trigger_error('Forcing a version for an asset was deprecated in 2.7 and will be removed in 3.0.', E_USER_DEPRECATED);
 
             $args = func_get_args();