setup.py docs should set PYTHONPATH

The built docs should be from the local version, ignoring any installed version.

This was resolved in coala core, but then almost certainly broken again in https://github.com/coala/coala/pull/4355

One probable way to solve this is to set PYTHONPATH in setup.py when it runs the docs subprocesses.

Edited May 03, 2018 by John Vandenberg

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