[MIE-1290 ] Generic template

Ticket: https://jira.nationalgeographic.com/browse/MIE-1290

To use the generic template you should provide a context with the following format:


```javascript
object = {
    type: 'article', // 'photo',
    url: 'http://objecttype.yoursite.com/object_id/1',
    display_name: 'Lorem ipsum',
    app: {
        url: 'http://objecttype.yoursite.com',
        display_name: 'My app'
    },
    image: {
        'url_small': 'http://objecttype.yoursite.com/object_id/1/image/small.jpg',
        'url_medium': 'http://objecttype.yoursite.com/object_id/1/image/medium.jpg',
        'url_large': 'http://objecttype.yoursite.com/object_id/1/image/large.jpg'
    },
    counts: {
        comments: 0,
        favorites: 0
    }
}

actor = {
    display_name: 'Roger Waters',
    url: 'http://members.yoursite.com/user_id/1'
}

verb = {
    type: 'FOLLOWED', // or 'UPLOADED', etc.
    image: {
        url: 'http://yoursite.com/assets/icon-followed.jpg'
    },
}
```
what made you decide on medium? are the sizes meant to enable future iterations with the sizes of the boxes?