Abstract YouTube API using Playtube

[gajus]

You can remove a lot of the code if you use https://github.com/gajus/playtube component. That'd reduce the bug surface and make the component easier to maintain. If playtube is missing any features, I will happily update it.

[pedronauck]

That's a really good idea, i'll make that change... thanks @gajus ;)