_attachGraphHandlers (graph) {
    graph.on('nodeContextSizeChanged', dimensions => this.emit('nodeContextSizeChanged', dimensions));
    graph.on('objectHighlighted', highlightedObject => this.emit('objectHighlighted', highlightedObject));
    graph.on('objectHovered', hoveredObject => this.emit('objectHovered', hoveredObject));
    graph.on('setView', view => this.setView(view));
    graph.on('viewUpdated', () => this.emit('viewUpdated'));
  }
Update the global definitions

@param {Object} An object map of definitions. See the format and defaults in (https://github.com/Netflix/Vizceral/wiki/Configuration#definitions-for-data-to-display)