CHANGELOG
=========
2.2.0
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* The `app` global variable is now injected even when using the twig service directly.
2.1.0
* added global variables access in a form theme
* added TwigEngine
* added TwigExtractor
* added a csrf_token function
* added a way to specify a default domain for a Twig template (via the
'trans_default_domain' tag)