test(tabs): account for BC in AngularJS v1.5.1

Due to a breaking change in v1.5.1 (introduced in
angular/angular.js@7617c08), a CSS
selector in `test/angularjs.org.spec.js` couldn't find the targeted element and failed.
This commit fixes the problem by manually wrapping the text nodes in `<span>` elements.

**NOTE:** The BC was reverted in v1.5.2, but will eventually be re-introduced in v1.6,
          so let's be prepared.

Closes angular#194

src/index.html

@@ -950,9 +950,9 @@ <h2>JavaScript Projects</h2>
     <script type="text/ng-template" id="tabs.html">
       <tabs>
         <pane title="Localization">
-          Date: {{ '2012-04-01' | date:'fullDate' }} <br>
-          Currency: {{ 123456 | currency }} <br>
-          Number: {{ 98765.4321 | number }} <br>
+          <span>Date: {{ '2012-04-01' | date:'fullDate' }}</span><br>
+          <span>Currency: {{ 123456 | currency }}</span><br>
+          <span>Number: {{ 98765.4321 | number }}</span><br>
         </pane>
         <pane title="Pluralization">
           <div ng-controller="BeerCounter">