Rename Angular2Spa to AngularSpa, plus rephrase "Angular 2" as "Angular" in many places

templates/AngularSpa/ClientApp/app/components/app/app.component.css

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+@media (max-width: 767px) {
+    /* On small screens, the nav menu spans the full width of the screen. Leave a space for it. */
+    .body-content {
+        padding-top: 50px;
+    }
+}

templates/AngularSpa/ClientApp/app/components/app/app.component.html

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+<div class='container-fluid'>
+    <div class='row'>
+        <div class='col-sm-3'>
+            <nav-menu></nav-menu>
+        </div>
+        <div class='col-sm-9 body-content'>
+            <router-outlet></router-outlet>
+        </div>
+    </div>
+</div>

templates/AngularSpa/ClientApp/app/components/app/app.component.ts

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+import { Component } from '@angular/core';
+
+@Component({
+    selector: 'app',
+    templateUrl: './app.component.html',
+    styleUrls: ['./app.component.css']
+})
+export class AppComponent {
+}