Incompability with Twig 2.0.0

[andrerom]

With Twig v2.0.0 out, I now get the following on composer update unless I downgrade to 1.x:

> eZ\Bundle\EzPublishCoreBundle\Composer\ScriptHandler::clearCache

                                                                                                                                                                                                              
  [Symfony\Component\Debug\Exception\ContextErrorException]                                                                                                                                                   
  Warning: Declaration of Lolautruche\EzCoreExtraBundle\Templating\Twig\TwigEnvironment::compileSource($source, $name = NULL) should be compatible with Twig_Environment::compileSource(Twig_Source $source)  
                                                                                                                                                                                                              

Script eZ\Bundle\EzPublishCoreBundle\Composer\ScriptHandler::clearCache handling the build event terminated with an exception

This is on v0.5.2