Python-liquid-extra

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- Added ``macro`` and ``call`` tags. Define a macro (a bit like ``capture`` but with
arguments) and run it with ``call`` (a bit like ``render`` but without hitting a
template loader).

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- Fixed a bug where ``if not foo contains 'bar'`` would raise a ``LiquidTypeError``. It
is now equivalent to ``if not (foo contains 'bar')``.

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- Depreciated filters that inherit from ``liquid.filter.Filter``. That's
``StylesheetTag``, ``ScriptTag`` and ``Index``. Use the function-based implementations
instead (``stylesheet_tag``, ``script_tag`` and ``index``).
- Depreciated the ``env`` argument to ``filters.JSON`` and ``filters.Translate``.

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- HTML filters are now marked as "safe" when ``autoescape`` is on.
- The ``href`` and ``src`` attributes of ``stylesheet_tag`` and ``script_tag`` are now
HTML escaped, even if ``autoescape`` is off.