Merge branch '2.1' into 2.2

* 2.1:
  Options small typo
  [Console] fixed unparsed StringInput tokens
  [TwigBridge] fixed trans twig extractor
  [DomCrawler] fix handling of schemes by Link::getUri()
  [Console] Fixed comment
  [TwigBridge] fixed the translator extractor that were not trimming the text in trans tags (closes #7056)
  Fixed handling absent href attribute in base tag
  added a DebuClassLoader::findFile() method to make the wrapping less invasive
  fixed CHANGELOG
  bumped Symfony version to 2.1.9-DEV
  updated VERSION for 2.1.8
  updated CHANGELOG for 2.1.8
  StringInput resets the given options.

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php

DebugClassLoader.php

@@ -69,6 +69,18 @@ public function unregister()
         spl_autoload_unregister(array($this, 'loadClass'));
     }
 
+    /**
+     * Finds a file by class name
+     *
+     * @param string $class A class name to resolve to file
+     *
+     * @return string|null
+     */
+    public function findFile($class)
+    {
+        return $this->classFinder->findFile($class);
+    }
+
     /**
      * Loads the given class or interface.
      *