[myspace] Add more data to info dict
`uploader` is an artist
`playlist` is an album
[myspace] Handle non-playable songs
I'm adding this because sometimes there is a song page, but you cannot play it.
Example: https://myspace.com/starset2/music/song/let-it-die-maniac-agenda-remix-bonus-track-95799916-106964439
It will be useful for downloading whole albums with songs like this.
[myspace] Redirect to other extractors
There are many songs just linked from Vevo/YouTube to MySpace.
Vevo example: https://myspace.com/threedaysgrace/music/song/animal-i-have-become-28400208-28218041
YouTube example: https://myspace.com/starset2/music/song/first-light-95799905-106964426
[myspace] Update tests
[myspace] Add extractor for albums