Merge branch '2.6' into 2.7

* 2.6:
  [FrameworkBundle] fix routing descriptor for options
  exit when Twig environment is not set
  [Routing] fix misleading test for condition
  [Debug] fix test
  [Debug] add missing conflict dep rules
  [TwigBundle] allowed SecurityBundle to use the latest versions of FrameworkBundle
  [HttpFoundation] Make use of isEmpty() method
  fix missing comma in YamlDumper
  [VarDumper] fix very special vars handling
  [Console] Helper\Table->addRow optimization
  [Console] Helper\Table->addRow optimization

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Descriptor/route_1.md
	src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Descriptor/route_2.md
	src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Descriptor/route_collection_1.md

Author: fabpot

Tests/DataCollector/DumpDataCollectorTest.php

@@ -49,8 +49,8 @@ public function testDump()
         );
         $this->assertSame($xDump, $dump);
 
-        $this->assertStringStartsWith(
-            'a:1:{i:0;a:5:{s:4:"data";O:39:"Symfony\Component\VarDumper\Cloner\Data":4:{s:45:"Symfony\Component\VarDumper\Cloner\Datadata";a:1:{i:0;a:1:{i:0;i:123;}}s:49:"Symfony\Component\VarDumper\Cloner\DatamaxDepth";i:-1;s:57:"Symfony\Component\VarDumper\Cloner\DatamaxItemsPerDepth";i:-1;s:54:"Symfony\Component\VarDumper\Cloner\DatauseRefHandles";i:-1;}s:4:"name";s:25:"DumpDataCollectorTest.php";s:4:"file";s:',
+        $this->assertStringMatchesFormat(
+            'a:1:{i:0;a:5:{s:4:"data";O:39:"Symfony\Component\VarDumper\Cloner\Data":4:{s:45:"Symfony\Component\VarDumper\Cloner\Datadata";a:1:{i:0;a:1:{i:0;i:123;}}s:49:"Symfony\Component\VarDumper\Cloner\DatamaxDepth";i:%i;s:57:"Symfony\Component\VarDumper\Cloner\DatamaxItemsPerDepth";i:%i;s:54:"Symfony\Component\VarDumper\Cloner\DatauseRefHandles";i:%i;}s:4:"name";s:25:"DumpDataCollectorTest.php";s:4:"file";s:%a',
             str_replace("\0", '', $collector->serialize())
         );