PEP8 and PEP257 tools have been renamed

[creffett]

Apparently they're officially 'pycodestyle' and 'pydocstyle' (and apparently have been for a couple years now -- I never noticed until I saw a warning message today!). PyPI and the executables themselves currently allow the old names as aliases, but it would be good to rename the Statick modules and change the pip dependencies for the sake of consistency with upstream and for future-proofing.

References: PyCQA/pycodestyle#466 PyCQA/pydocstyle#172

[tdenewiler]

That's a good idea. I'll start working on that. I'll try to support configuration files that use either name for the tool, such as a config.yaml that has either pycodestyle or pep8 flags both being used by the pycodestyle tool.

[denewiler]

Addressed with #29.