Fix pep8 violations which were exposed / reported by new version of p…

…ep8.

Fix typo in the changelog.

Bump version to 0.15.1

Bump version to 0.15.1

Bump version to 0.15.0.

Bump version to 0.15.0.

Bump version.

Bump version.

Update CHANGES, reference a CVE.

Ignore E902 (directory doesn't exist) error when linting docs/examples/

directory.

This directory is not included in the distribution tarball so we don't want lint
to fail there.