prepare 2.0 RC4 release

Author: fabpot

src/Symfony/Component/HttpKernel/Kernel.php

@@ -56,7 +56,7 @@ abstract class Kernel implements KernelInterface
  protected $startTime;
  protected $classes;
 
- const VERSION = '2.0.0-RC4-DEV';
+ const VERSION = '2.0.0-RC4';
 
  /**
  * Constructor.