Merge branch '3.4' into 4.0

* 3.4:
  use brace-style regex delimiters
  Fixed typo RecursiveIterator -> RecursiveIteratorIterator
  [Cache] fix logic for fetching tag versions on TagAwareAdapter
  [FrameworkBundle] Use the correct service id for CachePoolPruneCommand in its compiler pass
  Hide short exception trace by default
  [Doctrine Bridge] fix priority for doctrine event listeners
  [Validator] make phpdoc of ObjectInitializerInterface interface more accurate
  [Validator] fixes phpdoc reference to an interface that was removed in Symfony 3.0

Author: fabpot

Command/XliffLintCommand.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Translation\Command;
 
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\RuntimeException;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -81,14 +82,14 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         if (!$filename) {
             if (!$stdin = $this->getStdin()) {
-                throw new \RuntimeException('Please provide a filename or pipe file content to STDIN.');
+                throw new RuntimeException('Please provide a filename or pipe file content to STDIN.');
             }
 
             return $this->display($io, array($this->validate($stdin)));
         }
 
         if (!$this->isReadable($filename)) {
-            throw new \RuntimeException(sprintf('File or directory "%s" is not readable.', $filename));
+            throw new RuntimeException(sprintf('File or directory "%s" is not readable.', $filename));
         }
 
         $filesInfo = array();
@@ -136,7 +137,7 @@ private function display(SymfonyStyle $io, array $files)
             case 'json':
                 return $this->displayJson($io, $files);
             default:
-                throw new \InvalidArgumentException(sprintf('The format "%s" is not supported.', $this->format));
+                throw new InvalidArgumentException(sprintf('The format "%s" is not supported.', $this->format));
         }
     }