switch to flake8 that combines latest pep8 and latest pyflakes
Style guide for code blocks
Fix: W292 no newline at end of file
Style: Wrap long lines according to the style guide
one more url
better 'about imports' example
link to reST primer
don't reinvent how to specify versions, use a standard at http://semver.org/
Merge branch 'flake8'