Update to latest Sphinx #320
Description
Sphinx 1.5.5 (the latest when I'm writing this) doesn't support Python 2.6, so just don't bother trying to run Sphinx with tox on the Python 2.6 tests.
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Sphinx 1.5.5 (the latest when I'm writing this) doesn't support Python 2.6, so just don't bother trying to run Sphinx with tox on the Python 2.6 tests.