merged branch brtriver/twig-service-provider-bug (PR #245)
merged branch brtriver/twig-service-provider-bug (PR #245)

Commits
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4453e9f fixed for the latest TwigFormExtension

Discussion
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fixed for the latest TwigFormExtension

Now TwigFormExtension requires CsrfProviderInterface as the first arg but there is no arg for this in TwigServiceProvider, so it occurs the error below:

> Catchable fatal error: Argument 1 passed to Symfony\Bridge\Twig\Extension\FormExtension::__construct() must implement interface Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface, array given

then I set `$app['form.csrf_provider']` as the first arg.

mTorres/Silex,Xephi/Silex,RayRutjes/Silex,fabpot/Silex,peterkokot/Silex,romainneutron/Silex,cesarmarinhorj/Silex,beealone/Silex,GromNaN/Silex,naderman/Silex,lyrixx/Silex,Tobion/Silex,mathroc/Silex,lyrixx/Silex,mathroc/Silex,fabpot/Silex,tcx1000/Silex,lyrixx/Silex,Seldaek/Silex,plotek/Silex,CarsonF/Silex,peterkokot/Silex,akucherevskiy/developex_test,Tobion/Silex,arduanov/Silex,stof/Silex,stof/Silex,fhinkel/Silex,Incognito/silex-fork,cgsmith/Silex,arduanov/Silex,mmauri04/Silex,cesarmarinhorj/Silex,mmauri04/Silex,romainneutron/Silex,jdreesen/Silex,gencer/Silex,fhinkel/Silex,CarsonF/Silex,SanderKnape/Silex,mTorres/Silex,SpacePossum/Silex,beealone/Silex,RayRutjes/Silex,GromNaN/Silex,Seldaek/Silex,GromNaN/Silex,romainneutron/Silex,cgsmith/Silex,JPry/Silex,naderman/Silex,silexphp/Silex,stof/Silex,akucherevskiy/developex_test,tcx1000/Silex,naderman/Silex,Incognito/silex-fork,SanderKnape/Silex,akucherevskiy/developex_test,CarsonF/Silex,lokhman/Silex,SpacePossum/Silex,jdreesen/Silex,plotek/Silex,Xephi/Silex,Tobion/Silex,peterkokot/Silex,lokhman/Silex,JPry/Silex