Jaffle

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- Fix: Log filters still do not work for process loggers

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- Add config file validation
- Fix: Log filters do not work for the root and process loggers

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- Fix: String interpolations in logger settings are not evaluated

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- Fix: String interpolations in app options are not evaluated

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- Now String interpolations are evaluated at runtime instead of on loading the configuration
- Add functions ``jq_all()`` and ``jq_first()`` and their aliases ``jq()`` and ``jqf()``
- Change environment variable prefix ``T_VAR_`` to ``J_VAR_``
- Simplify ``BaseJaffleApp`` I/F
- Improve Tornado app stability on syntax errors and exceptions raised in ``start()``
- Fix hidden Tornado log messages

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- Add ``fg()``, ``bg()`` and ``reset()`` function
- Fix errors on starting/stopping threaded Tornado app