Cruft

- [Fixed Issue 3](https://github.com/cruft/cruft/issues/3): Patch failed to apply.
- Updated to use pathlib.
- Improved `pyproject.toml` skip_files, avoiding duplication into `.cruft.json` file.

- Added optional support for reading skip options from `pyproject.toml`.

- Added `link` command to link existing repositories to the Cookiecutter template that created them.
- Added `skip` option to `.cruft.json` file allowing template updates to be skipped per a repository.
- Improved patch applying from template updates.
- Added an interactive option on the `update` command to skip an individual update, while marking a repository as up-to-date.

- Initial API stable release.