Merge branch '2.2' into 2.3

* 2.2:
  Throw exception if value is passed to VALUE_NONE input, long syntax
  fixed date type format pattern regex
  [FrameworkBundle] tweaked previous merge (refs #8242)
  do not re-register commands each time a Console\Application is run
  [Process] moved env check to the Process class (refs #8227)
  fix issue where $_ENV contains array vals
  [DomCrawler] Fix handling file:// without a host
  [Form] corrected interface bind() method defined against in deprecation notice
  [Finder] Fix SplFileInfo::getContents isn't working with ssh2 protocol

Conflicts:
	src/Symfony/Component/Console/Tests/Input/ArgvInputTest.php
	src/Symfony/Component/DomCrawler/Link.php
	src/Symfony/Component/Form/Form.php

Author: fabpot

Console/Application.php

@@ -27,6 +27,7 @@
 class Application extends BaseApplication
 {
     private $kernel;
+    private $commandsRegistered = false;
 
     /**
      * Constructor.
@@ -65,7 +66,11 @@ public function getKernel()
      */
     public function doRun(InputInterface $input, OutputInterface $output)
     {
-        $this->registerCommands();
+        if (!$this->commandsRegistered) {
+            $this->registerCommands();
+
+            $this->commandsRegistered = true;
+        }
 
         $this->setDispatcher($this->kernel->getContainer()->get('event_dispatcher'));