Pyramid-mako

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- Add support for Python 3.5, 3.6, 3.7.

- Require ``mako >= 1.1.0``.

- Add a config option for ``preprocessor_wants_settings``. If set to ``true``,
the ``preprocessor`` will be wrapped in a function that invokes the
preprocessor with pyramid's config settings as the second argument.

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- Fix mako.imports so that aslist() does not flatten. See issue 23
(https://github.com/Pylons/pyramid_mako/issues/23)

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- Bump the required version of Mako to 0.8 or newer for issue 22 (add
future_imports). If you would like to use an older version of Mako, please
pin your dependency to version 0.3.1 of pyramid_mako.

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- Add new configuration variable for future_imports. See issue 22
(https://github.com/Pylons/pyramid_mako/issues/22)
- Fix issue 19, whereby pyramid.reload_templates stopped functioning due to
changes in pyramid_mako. The lookup is now completed at template render,
instead of when the factory returns the renderer. See:
(https://github.com/Pylons/pyramid_mako/issues/19)
- Tuple return values in the form of ('defname', {}) are no longer supported,
and will result in a ValueError being raised.
- Fix an packaging issue whereby \*.foo files were not included in the MANIFEST.
- Caller-relative template lookup is now supported. Any template that fails
to be found in the default search paths will be searched relative to the
caller package.
- Allow overriding the ``pyramid.reload_templates`` using
``mako.reload_templates``.
- Change the way that custom user values passed to the renderer are merged with
the system provided variables. This allows the user to pass in a variable
named 'context' and have it correctly override the system provided context,
and THEN get correctly renamed so that Mako doesn't complain about a variable
being passed in that isn't allowed due to it being reserved.
- Drop testing dependency on ``nose-selecttests``.

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- Re-enable lazy loading of the mako renderer, allowing the settings
to be configured after pyramid_mako has been included, as long as everything
happens in the same commit.

================

- Add a new Configurator directive, ``config.add_mako_renderer`` which
can be used to add a new mako renderer for a given extension. This
directive accepts an optional ``settings_prefix`` to load settings and
configuration differently per-renderer as well.

- Removed the private APIs, ``IMakoLookup``, ``MakoRendererFactoryHelper``,
and ``renderer_factory``. See the new ``config.add_mako_renderer`` API
for updating offending code.

- Remove dependency on ``pyramid.interfaces.ITemplateRenderer`` from
Pyramid 1.5.