APPWTV-28  - events

* Added up-down navigation  
* Added arrow key keybindings (start animation with enter, stop with spacebar, move with arrows)  
* Integrated ui.js and events.js into app.js  - both are loaded at app.launch() time

To start browsing open Chrome Dev Tools, then type: 
```javascript
webinosTV.app.connectUi.browse.startBrowsing()
```
then click on the browser window and start using arrow keys...