Search for tags with the *.*.* patten for version

This has been done in a way that I hope might be able to be upstreamed
in to versioneer. This is not garanteed but it would be good if it
could be.

Please see https://github.com/warner/python-versioneer/pull/186 and
https://github.com/wsalmonct/python-versioneer/tree/feature/regexTags
for further details.