Django-ttag

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* More documentation fixes.

* ``AsTag`` has a new ``as_default`` Meta option to provide a default variable
name if the ``as`` argument is not provided.

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* Minor documentation fixes.

* Fixed block tags so they actually work. Thanks again, Jannis.

* Fixed an issue when subclassing tags based on the ``AsTag`` helper.

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* Added the ``TemplateTag`` helper. Thanks Jannis Leidel!

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* Added backwards compatibility for ``Arg.clean``, so it can once again just
have ``data`` as the only parameter.

* Tidy up the handling of missing context variables (with bugfix in v2.1.1).

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Backwards Incompatible changes
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* Changed ``Arg.clean`` to require both ``data`` and ``context`` as parameters.

* Changed the function of the ``null`` parameter of ``Arg.__init__``. Now,
when set to ``False`` (default), an exception is raised on a missing context
variable. When ``True``, a missing context variable is set to ``None``.