Chameleon

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- Added ``RenderError`` exception which indicates that an error
occurred during the evaluation of an expression.

- Clean up ``TemplateError`` exception implementation.

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- Pass ``search_path`` to template class when loaded using
``TemplateLoader`` (or one of the derived classes).
[faassen]

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- Fix logging deprecation.

- Fix environment-based configuration logging error.

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- Fix minor compilation error.

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- Add support for ``i18n:context``.
[wiggy]

- Add missing 'parity' repeat property.
[voxspox]

- Don't modify environment when getting variables from it.
[fschulze]

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- If a repeat expression evaluates to ``None`` then it is now
equivalent to an empty set.

This changes a behavior introduced in 2.14.

This fixes issue 172.

- Remove fossil test dependency on deprecated ``distribute``.

- Add explicit support / testing for Python 3.3 / 3.4.

- Drop explicit support for Python 2.5 (out of maintenance, and no longer
supported by ``tox`` or ``Travis-CI``).