UI improvements

Summary:
* expanding/collapsing nodes
* memoizing table rows
* adding sidebar

Reviewed By: davidaurelio

Differential Revision: D15621070

fbshipit-source-id: 9335259d3b4bc1348e917782918eb1e0f678ba17

flow-typed/npm/lodash.memoize_vx.x.x.js

@@ -0,0 +1,19 @@
+// flow-typed signature: 0eceddcdb50aa9bf578c375a12ef9aad
+// flow-typed version: <<STUB>>/lodash.memoize_v4.1.2/flow_v0.91.0
+
+/**
+ * This is an autogenerated libdef stub for:
+ *
+ *   'lodash.memoize'
+ *
+ * Fill this stub out by replacing all the `any` types.
+ *
+ * Once filled out, we encourage you to share your work with the
+ * community by sending a pull request to:
+ * https://github.com/flowtype/flow-typed
+ */
+
+declare module 'lodash.memoize' {
+  declare function memoize<T>(fn: T, resolver?: Function): T;
+  declare export default typeof memoize;
+}