removed 'render' method from graph module
removed 'render' method from graph module

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