Add bio and counts to User

[reneklacan]

Hello,

Users endpoint (https://instagram.com/developer/endpoints/users) returns following response:

{
    "data": {
        "id": "1574083",
        "username": "snoopdogg",
        "full_name": "Snoop Dogg",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_1574083_75sq_1295469061.jpg",
        "bio": "This is my bio",
        "website": "http://snoopdogg.com",
        "counts": {
            "media": 1320,
            "follows": 420,
            "followed_by": 3410
        }
}

This PR changes User to include bio and counts.

What do you think?

[meteficha]

Looks great, thanks! Released as ig-0.3.