Enhance user feed data

User feed data has additional fields, that are ```website``` and ```bio```. Here is a sample of resulting user feed data JSON from Instagram Relationship endpoint (obtained using curl)
```
{
  "data": [
    {
      "id": "55969444",
      "full_name": "Michelle Cheong",
      "profile_picture": "http://images.ak.instagram.com/profiles/profile_55969444_75sq_1384792859.jpg",
      "website": "",
      "bio": "I have a degree in food consumption and staring.",
      "username": "muahmysocks"
    }, ..... //other users
  ],
  "meta": {
    "code": 200
  },
  "pagination": {
    "next_cursor": "1389620495075",
    "next_url": "https://api.instagram.com/v1/users/711643571/followed-by?access_token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&cursor=1389620495075"
  }
}```

Hence I add new bio and website fields into ```UserFeedData``` class and deprecate the unnecessary methods. 
I also add a simple unit test to check ```UserFeedData ``` fields.