Github-archive

- Adds an `--include` and `--exclude` CLI flag that accepts a comma-separated list of repo names to either include or exclude. If neither are passed, no filtering will occur (closes 43)

- Adds the ability to specify a custom base_url for GitHub (useful for enterprise GitHub users with a custom hostname, closes 41)

- Adds `mypy` and fixes typing errors

- Bumps `woodchips` to use the new implementation (also fixes a bug where we were creating a new `woodchips.Logger` class each time we called the logger instead of reusing the same logger instance)
- Adds missing `__all__` variable for importing
- Added Python type hinting

- Uses `woodchips` for logging and removes internal logging logic from the package
- Refactors git commands to not change directories but instead run commands with the `-C` flag to invoke it in the directory we want

- Fixes a bug that wouldn't allow for gist cloning/pulling because of a bad "forks" check on a gist GitHub object
- Adds a missing check to ensure that at least one CLI argument was passed (closes 40)
- No longer invoke a shell while using the subprocess module. Git operations should now be more stable across operating systems