Reference bootstrap JS in KnockoutSpa/ReactSpa/VueSpa. Fixes aspnet#846

Author: SteveSandersonMS

templates/KnockoutSpa/ClientApp/boot.ts

@@ -1,4 +1,5 @@
 import './css/site.css';
+import 'bootstrap';
 import * as ko from 'knockout';
 import './webpack-component-loader';
 import AppRootComponent from './components/app-root/app-root';

templates/ReactSpa/ClientApp/boot.tsx

@@ -1,5 +1,5 @@
 import './css/site.css';
-
+import 'bootstrap';
 import * as React from 'react';
 import * as ReactDOM from 'react-dom';
 import { browserHistory, Router } from 'react-router';

templates/VueSpa/ClientApp/boot.ts

@@ -1,3 +1,4 @@
+import 'bootstrap';
 import Vue from 'vue';
 import VueRouter from 'vue-router';
 Vue.use(VueRouter);