Merge branch '3.4' into 4.1

* 3.4:
  [travis][appveyor] use symfony/flex to accelerate builds
  Add missing stderr redirection
  clean up unused code
  [Filesystem] Add test to prevent regression when using array|resource with dumpFile
  [Security] Call AccessListener after LogoutListener

Author: nicolas-grekas

Tests/FilesystemTest.php

@@ -1467,6 +1467,31 @@ public function testDumpFile()
         }
     }
 
+    public function testDumpFileWithArray()
+    {
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
+
+        $this->filesystem->dumpFile($filename, array('bar'));
+
+        $this->assertFileExists($filename);
+        $this->assertStringEqualsFile($filename, 'bar');
+    }
+
+    public function testDumpFileWithResource()
+    {
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
+
+        $resource = fopen('php://memory', 'rw');
+        fwrite($resource, 'bar');
+        fseek($resource, 0);
+
+        $this->filesystem->dumpFile($filename, $resource);
+
+        fclose($resource);
+        $this->assertFileExists($filename);
+        $this->assertStringEqualsFile($filename, 'bar');
+    }
+
     public function testDumpFileOverwritesAnExistingFile()
     {
         $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo.txt';