feat(aio): add initial doc viewer

with lots of fixes from Igor and Ward <3

angular.io/e2e/app.e2e-spec.ts

@@ -7,8 +7,10 @@ describe('site App', function() {
     page = new SitePage();
   });
 
-  it('should display message saying app works', () => {
+  it('should show features text after clicking "Features"', () => {
     page.navigateTo();
-    expect(page.getParagraphText()).toEqual('home-page works!');
+    page.featureLink.click().then(() => {
+      expect(page.getDocViewerText()).toContain('Progressive web apps');
+    });
   });
 });

angular.io/e2e/app.po.ts

@@ -1,11 +1,14 @@
 import { browser, element, by } from 'protractor';
 
 export class SitePage {
+
+  featureLink = element(by.css('md-toolbar a[aioNavLink=features]'));
+
   navigateTo() {
     return browser.get('/');
   }
 
-  getParagraphText() {
-    return element(by.css('app-home-page p')).getText();
+  getDocViewerText() {
+    return element(by.css('aio-doc-viewer')).getText();
   }
 }