Gocept.jslint

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- Add support for linting JS files contained in zipped eggs (9453).
- Add an entry point for running jslint from the command line (9449).
- Skip tests if node.js is not available. Skipping tests only works properly in
Python >= 2.7, though. (9458)

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- Implement custom error ignores (9456).

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- first release.