Issue 1: Tests now xfail when no Git repository is available.
1.5
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``timestamp`` in SCM info is now parsed into a timezone-aware datetime.datetime object, allowing for the timezone to be rendered using arbitrary date formatting.
1.4.2
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Fix Replacer resolution on Python 2.
1.4
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Refined implementation and example for linking timestamps. Added support for Mercurial repos.
1.3.1
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Fix error on Python 2 due to old-style class resolution.
1.3
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Moved hosting to Github.
Add support for linking timestamps from a git repository according to version tags as found in the file.