refactor(demos): give each component section its own view

demos/component-docs/popups/popups.html

@@ -0,0 +1,10 @@
+
+<ion-navbar *navbar>
+  <ion-title>Popups</ion-title>
+</ion-navbar>
+
+<ion-content class="has-header padding">
+  <button block (click)="showPopup()">
+    Show Popup
+  </button>
+</ion-content>

demos/component-docs/popups/popups.ts

@@ -0,0 +1,16 @@
+import {IonicPlatform, IonicView, Popup} from 'ionic/ionic';
+
+@IonicView({
+    templateUrl: 'popups/popups.html',
+})
+export class PopupsPage {
+
+  constructor(popup: Popup) {
+    this.popup = popup;
+  }
+
+  showPopup() {
+    this.popup.alert("Popup Title").then(() => {
+    });
+  }
+}