add piwik installation

www/analytics/vendor/twig/twig/README.rst

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+Twig, the flexible, fast, and secure template language for PHP
+==============================================================
+
+Twig is a template language for PHP, released under the new BSD license (code
+and documentation).
+
+Twig uses a syntax similar to the Django and Jinja template languages which
+inspired the Twig runtime environment.
+
+More Information
+----------------
+
+Read the `documentation`_ for more information.
+
+.. _documentation: http://twig.sensiolabs.org/documentation