[w3c/manifest] Add shortcuts (#575)

Under Android 7.1 it's possible to add shortcuts to the most important features of an app.
https://developer.android.com/guide/topics/ui/shortcuts.html
 It would be very useful for web apps too. This could benefit not only the user when he long presses the icon on the home screen, but also search engines and app stores, which can display these shortcuts to give direct access to the main features of an app.

```
"shortcuts": [{
    "long_label": "New conversation",
    "short_label": "New",
    "icon": "/images/plus.svg",
    "url": "/conversations/new"
}, {
    "long_label": "Search conversation",
    "short_label": "Search",
    "icon": "/images/magnify.svg",
    "url": "/conversations/search"
    }
]
```


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