Version-filter

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- Use forked version of python-semanticversion to get NPM consistent caret (^) matching behavior

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- Add support for pre-release locking and matching pre-releases by string

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- Do two-staging parsing of version strings to be more accurate and robust
- Fix a couple of documentation bugs with the package name vs project name

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- Accept (but ignore) version strings with leading 'v' or '=' characters

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- Add support for pre-release versions

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- Fix some documentation