Exposing more video statistics

[ishields]

Would it make sense to expose more statistics so they can be used when available?
The YouTube api returns a lot more useful statistics than what is available via the model (because the _video_statistics attribute is private).

 {"viewCount"=>"1036033", "likeCount"=>"27742", "dislikeCount"=>"1160", "favoriteCount"=>"0", "commentCount"=>"1134"}

Either these raw statistics could be available as a hash or as separate methods. Any thoughts?

[thibaudgg]

That sounds good to add, please feel free to open a pull request.

[ishields]

Do you have a preference on whether to just expose "video_stats" or do individual methods for each statistic type?

[thibaudgg]

I think video_stats should be enough to expose.

[markets]

@ishields I just send a PR 👉🏼 #220