Pkgdev

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- pkgdev commit: Support pulling historical data from unconfigured repos.

- Add initial zsh completion support (16).

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- Replace --ignore-failures option with -A/--ask for ``pkgdev commit`` and
``pkgdev push``.

- pkgdev push: Drop explicitly enabled --signed option for gentoo repo (27).

- pkgdev commit: Add support for -b/--bug and -c/--closes options.

- pkgdev commit: Initial support for summary generation for metadata.xml
changes (9).

- pkgdev commit: Enabled signed commits and signoffs based on repo metadata
(25).

- pkgdev commit: Initial support for generating modify summaries.

- pkgdev commit: Support summary generation for single rename changes that
don't involve revbumps.

- pkgdev commit: Add -M/--message-template support.

- pkgdev commit: Support multiple -m/--message options similar to ``git
commit``.

- pkgdev commit: Support generating manifest summaries (12).

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- Initial release.

- pkgdev commit: Add subcommand wrapping ``git commit`` supporting commit
message templating, ebuild manifesting, structured file mangling, and commit
scanning via pkgcheck.

- pkgdev push: Add subcommand wrapping ``git push`` that verifies local commits
with pkgcheck before pushing them upstream.

- pkgdev manifest: Add subcommand for manifesting ebuilds.