Update src/Acme/DemoBundle/Twig/Extension/DemoExtension.php
merged branch matteocaberlotto/patch-1 (PR #493)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #493).

Commits
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4b19ada Update src/Acme/DemoBundle/Twig/Extension/DemoExtension.php

Discussion
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Update src/Acme/DemoBundle/Twig/Extension/DemoExtension.php

modified FilesystemLoader to a more generic \Twig_LoaderInterface

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by Baachi at 2013-02-04T11:01:54Z

You should remove the `use` statement, too.