Picky-pip

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- check to see if ``pip`` takes ``--disable-pip-version-check`` before using it.

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- correct the dependency specification of :mod:`argparse` so it only
occurs on Python 2.6

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- Python 3 support

- Fixed handling of package 'extras' in pip output and specifications.

- Fixed handling of arbitrary equality clauses in pip output and specifications.

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- Initial Release