deprecated form_enctype() in favor of form_start()
2.2.0
added a controller function to help generating controller references
added a render_esi and a render_hinclude function
[BC BREAK] restricted the render tag to only accept URIs or ControllerReference instances (the signature changed)
added a render function to render a request
The app global variable is now injected even when using the twig service directly.
Added an optional parameter to the path and url function which allows to generate
relative paths (e.g. "../parent-file") and scheme-relative URLs (e.g. "//example.com/dir/file").
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)
