Merge branch '201-Implement-Sanitizer' into 'staging'

Adds domSanitizer for quizNow Module

Closes #201

See merge request arsnova/topic-cloud!108

src/app/components/shared/quiz-now/quiz-now.component.html

 <div class="container">
-  <iframe class="responsive-iframe" src="https://arsnova.click"></iframe>
+  <iframe class="responsive-iframe" [src]="urlSafe"></iframe>
 </div>

src/app/components/shared/quiz-now/quiz-now.component.ts

@@ -6,4 +6,11 @@ import { DomSanitizer, SafeResourceUrl } from '@angular/platform-browser';
   styleUrls: ['./quiz-now.component.scss']
 })
 export class QuizNowComponent {
+  urlSafe: SafeResourceUrl;
+
+  constructor(public sanitizer: DomSanitizer) { }
+
+  ngOnInit() {
+    this.urlSafe= this.sanitizer.bypassSecurityTrustResourceUrl("https://arsnova.click/");
+  }
 }