Captainhook

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- Delete all captainhook checkers before installing.
- Don't write pyc files in checkers.
- Print version on install.
- Allow checkers to have different module names than checker names.
- Change flake8 checker to obey [flake8] section of tox.ini.
- Fix bug when missing a tox.ini file.

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- Optionally pass extra parameters to checkers.
- Checker controlled defaults.

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- Python3 compatible.

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- Easy addition of new checkers.

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- python3 syntax checker added.

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- Initial working version.