Интеграция окружения для тестирования

Добавлены утилиты тестирования tox и travis-ci.

    /*
    * Written in 2013 by Alexandr Sokolovskiy <alex@obout.ru>
    *
    * To the extent possible under law, the author have dedicated all
    * copyright and related and neighboring rights to this software to
    * the public domain worldwide. This software is distributed without
    * any warranty. http://creativecommons.org/publicdomain/zero/1.0/
    */