Pip-stripper

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* generating `requirements.txt` instead of `requirements.dev.txt`
* improved pip package name to python import name matching, using `Module.pkg_resources`.
* README.md changes
* adjustments to argparse help text

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* added `pipstripper` cli mode.
* swapped --scan option for the more explicit --noscan
* added more docstrings
* README.md changes

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* fixed packaging errors for README and version

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* various doc and badges adjustments

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* various doc and badges adjustments

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* corrected home page