Remove underscore dependency, and pull in new vega util file.
Remove underscore dependency, and pull in new vega util file.

aashish24/tangelo,ecohealthalliance/tangelo,ecohealthalliance/tangelo,Kitware/tangelo,ecohealthalliance/tangelo,aashish24/tangelo,aashish24/tangelo,mathstuf/tangelo,Kitware/tangelo,Kitware/tangelo,mathstuf/tangelo,mathstuf/tangelo