git-upstream 0.12.0

- Changelog for 0.12.0 Release.
- Fix help subcommand.
- Remove compatibility hacks causing issues with newer GitPython.
- Check valid import branch argument value.
- Report import branch name used by default.
- Use tag for import branch naming when given.
- Use python for pre/post scripts.
- Support tags for input args.
- Allow SHA1 as reference for inputs.
- Fix finish merge to ensure correct contents.
- Always have rebase perform finish.
- Ensure correct mode of git-rebase executed.
- Support old GitPython transform_kwargs signature.
- Refactor test to allow additional.
- Ensure parent options retained for exec'ed finish.
- Fix access for pre-script dict member.
- Update .gitignore with .eggs path for setuptools.
- Enable default GIT_PYTHON_TRACE for tests.
- Consolidate to a single separator character.
- Fix broken interactive mode to be usable.
- Record upstream branch in import merge commit.
- Handle all local changes landed upstream.
- Detect cherry-picked changes without Change-Id.
- Example in USAGE.md should reference .gitreview.
- Use a recent pbr.
- Add tool to recreate git repo from test scenarios.
- Detect when nothing to import.
- Merge multiple unrelated additional branches.
- Support for python 3.
- Show rebase help during interactive import.
- Simplify USAGE.md example by using a local remote.
- Fix / simplify the example patch in USAGE.md.
- Minor change to the USAGE.md.
- Handle missing merge during initial import.
- Include parent commits in git graph.
- Update package author/maintainer details.
- Match name and result of is_detached() method.
- Install coverage and fix command line to call.
- Refactor import command tests to use scenarios.
- Consolidate note reference and header constants.
- Consolidate BadName exception compatibility.
- Keep modifications to GitPython objects in single module.
- Support test specific scripts to modify test areas.
- Ensure end of arguments marked clearly.
- Fix a tiny typo in USAGE.