Ghcloneall

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- Can now clone all user's gists.
- Command line args: --gists, --repos.

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- Skip forks and archived repositories by default.
- Command-line args: --include-forks, --exclude-forks.
- Command-line args: --include-archived, --exclude-archived.
- Command-line args: --include-private, --exclude-private.
- Command-line args: --include-disabled, --exclude-disabled.
- Use a custom User-Agent header when talking to GitHub.

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- Drop support for Python 3.3 and 3.4.
- Add a test suite.
- Fix AttributeError: 'str' object has no attribute 'format_map' on Python 2.

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- Command line args: -q, --quiet
- Fix display corruption on ^C

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- Fix TypeError: get() got an unexpected keyword argument 'fallback' on
Python 2.

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- Comprehensive rebranding:

- Rename the GitHub repository to https://github.com/mgedmin/ghcloneall
- Rename ``cloneall.py`` to ``ghcloneall.py``
- Rename the config file to ``.ghcloneallrc``, and rename the config
section to ``[ghcloneall]``.

- Don't print tracebacks on ^C (this regressed in 1.5).