Public lists

@adgad This is a breaking change to the fetch API. I can't think of a nicer way to do it.

```
{
    "items": [
        {
            "type": "favourite",
            "resourceType": "unknown",
            "created": "1415048545881",
            "uuidv3": "noo",
            "for": "mattc",
            "displayText": "boo",
            "id": "activity:33fddd3b576ff9b4bceabadf584915b775da1655"
        }
    ],
    "isPublic": true
}
```