Gitman

- Added Git plugin support via: `git deps`.
- Removed `--no-clean` option (now the default) on `install` and `update`.
- Added `--clean` option to delete ignored files on `install` and `update`.
- Switched to `install` rather than `update` of nested dependencies.
- Added `--all` option on `update` to update all nested dependencies.
- Disabled warnings when running `install` without locked sources.
- Added `--no-lock` option to disable version recording.

- Fixed crash when running with some sources missing.

- Switched to cloning for initial working tree creation.

- Replaced `install` command with `update`.
- Updated `install` command to use locked dependency versions.
- Now sorting sources after a successful `update`.
- Now requiring `--force` to `uninstall` with uncommitted changes.
- Updated `list` command to show full shell commands.

- Ensures files are not needlessly reloaded with newer versions of YORM.

- Added `--no-clean` option to disable removing untracked files.
- Added support for `rev-parse` dates as the dependency `rev`.