Pre-commit

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- Don't crash when `always_run` is `True` and `files` is not provided.
- Set `VIRTUALENV_NO_DOWNLOAD` when making python virtualenvs.

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- Add a `pre-commit sample-config` command
- Enable ansi color escapes on modern windows
- `autoupdate` now defaults to `--tags-only`, use `--bleeding-edge` for the
old behavior
- Add support for `log_file` in hook configuration to tee hook output to a
file for CI consumption, etc.
- Fix crash with unicode commit messages during merges in python 2.
- Add a `pass_filenames` option to allow disabling automatic filename
positional arguments to hooks.

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- Fix regression in 0.13.5: allow `always_run` and `files` together despite
doing nothing.

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- 0.13.4 contained incorrect files

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- Add `--show-diff-on-failure` option to `pre-commit run`
- Replace `jsonschema` with better error messages

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- Add `--allow-missing-config` to install: allows `git commit` without a
configuration.