Parse version from directory name if not a git repository. #142
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This is intended to address #141.
If git is not found, or if the directory is not a git repository, this instead tries to pull a version string from the source directory name. It will succeed on anything that looks like a three-level version string after a "-", and will include anything after that version, to allow the user to specify extra information after the version if desired.
As the current git-tag-finding code will include the initial 'v' in the tag, the directory-based version string will be slightly different (eg, "3.7.0" instead of "v3.7.0"). I can change this to be consistent with the git method if that would be better.