Introduce React/TypeScript/TSLint into app for new UI components

npm run transpile
  Works on files under js/react/
  Outputs files right next to the .tsx file

This is part of our `grunt dev` task, as well as the default grunt task,
which does everything else necessary to get a raw git checkout ready to
run.

js/react/sub/test2.tsx

@@ -0,0 +1,38 @@
+import React from 'react';
+
+interface IProps { name: string; }
+
+interface IState { count: number; }
+
+
+const items = [
+  'one',
+  'two',
+  'three',
+  'four',
+];
+
+export class InlineReply extends React.Component<IProps, IState> {
+  constructor(props: IProps) {
+    super(props);
+
+    this.state = {
+      count: 0,
+    };
+  }
+
+  public render() {
+    const { name } = this.props;
+
+    return (
+      <div>
+        This is a basic component. Hi there, {name}!
+      </div>
+    );
+  }
+}
+
+export function greeter2(person: any) {
+    // console.log(items);
+    return `Hello, ${person}`;
+}

js/react/test.ts

@@ -0,0 +1,7 @@
+import { InlineReply } from './sub/test2';
+
+// console.log(InlineReply);
+
+export function greeter(person: any) {
+    return 'Hello, ' + person;
+}