UF disambiguation bug fixed.  vivotools added to GitHub

bibtex2rdf 1.2 had a bug which caused authorships and
authorInAuthorships for UF authors requiring disambiguation to contain
poorly formed URIs for the authors that required disambigation.  Rather
than a URI pointed at an author, the URI incorrecting contained _all_
the URIs of possible autors separated by semi colons.  The repaired code
selects an author and provides a single valid URI for the selected
author.