feat: introduce Title service

Closes #612

Closes #900

modules/angular2/src/services/title.js

@@ -0,0 +1,12 @@
+import {DOM} from 'angular2/src/dom/dom_adapter';
+
+export class Title {
+
+  getTitle():string {
+    return DOM.getTitle();
+  }
+
+  setTitle(newTitle:string) {
+    DOM.setTitle(newTitle);
+  }
+}