Addressed @foot's UI comments

client/app/scripts/utils/topology-utils.js

@@ -182,3 +182,7 @@ export function graphExceedsComplexityThresh(stats) {
   // Check to see if complexity is high. Used to trigger table view on page load.
   return (stats.get('node_count') + (2 * stats.get('edge_count'))) > 500;
 }
+
+export function zoomCacheKey(props) {
+  return `${props.topologyId}-${JSON.stringify(props.topologyOptions)}`;
+}