[Config] fixed 'scheme://' not detected as absolute path

This also allows the use of configuration files stored in phar files.

src/Symfony/Component/Config/FileLocator.php

@@ -89,6 +89,7 @@ class FileLocator implements FileLocatorInterface
                 && $file[1] == ':'
                 && ($file[2] == '\\' || $file[2] == '/')
             )
+            || null !== parse_url($file, PHP_URL_SCHEME)
         ) {
             return true;
         }

tests/Symfony/Tests/Component/Config/FileLocatorTest.php

@@ -35,6 +35,8 @@ class FileLocatorTest extends \PHPUnit_Framework_TestCase
             array('c:\\\\foo.xml'),
             array('c:/foo.xml'),
             array('\\server\\foo.xml'),
+            array('https://server/foo.xml'),
+            array('phar://server/foo.xml'),
         );
     }