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*Release date: UNRELEASED*
- Use GitHub's `ignore template
<https://github.com/github/gitignore/blob/master/Python.gitignore>`_ for
.gitignore and .hgignore
- setup.py: add sample classifiers as multiline string (not list)
- Rename NEWS.txt to NEWS.rst (for rendering in GitHub)
- 3: Add links to packaging guides