twig implementation

vendor/symfony/twig-bridge/Symfony/Bridge/Twig/README.md

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+Twig Bridge
+===========
+
+Provides integration for [Twig](http://twig.sensiolabs.org/) with various
+Symfony2 components.
+
+Resources
+---------
+
+If you want to run the unit tests, install dev dependencies before
+running PHPUnit:
+
+    $ cd path/to/Symfony/Bridge/Twig/
+    $ composer.phar install --dev
+    $ phpunit