Bug 1094094 - [Stingray] Implement Navigation of Apps Deck

1. Enable app launch in app-deck
2. refine styling based on UI/UX spec (though it is not completed yet)
3. l10n work of app-deck
4. refer to the patch of bug 1098274, add 'pin to home' functionality
The 'blur' here is not actually what we used for 'blur'. It means 'the current focus is not pin-able'. So I would suggest to judge whether the element is pin-able on context_menu.js and remove this event.
Or, rather, change the event name.