FIX bug in slide template: when using angular to retrieve an image, use the ng-src attribute instead of the src attribute. Otherwise the img tries to download the {{xxx}} element before angular has had time to change it to the proper filename.
FIX bug in slide template: when using angular to retrieve an image, use the ng-src attribute instead of the src attribute. Otherwise the img tries to download the {{xxx}} element before angular has had time to change it to the proper filename.

```html
                <img src="{{vm.activeContent.content}}" class="active-image" style="width:100%" /> WRONG
                <img ng-src="{{vm.activeContent.content}}" class="active-image" style="width:100%" /> OK
```

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