Toolrack

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- Fixes to preserve Python 3.5 compatibility.

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- Update ``TempDirFixture`` to use/return pathlib.Path elements.
- Add ``TempDirFixture.mksymlink`` function.
- Change ``toolrack.path.match_files`` to return a list of ``pathlib.Path`` objects.
- Update ``toolrack.fsmap`` to use pathlib.Path elements.

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- Fix version number.

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- Change license to LGPLv3.
- 100% unittest coverage.

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- Update references to GitHub.

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- Export ``StreamHelper`` and ``TempDirFixture``.