[myspace] Update extractor

Ok. Now it should download from MySpace faster thanks to player_url.

New values in info dict are useful for downloading whole album. With `-o "%(uploader)s/%(playlist)s/%(title)s.%(ext)s"` it creates nice `Artist/Album/Song` folder structure. (For songs with no album `youtube-dl` sets `%(playlist)s` to `_` instead leaving it empty. Why?)

Passing on non-playable songs instead of raising error is useful for album downloading too. They can't be downloaded anyway.

I've found only two redirects on MySpace, but there may be more. On new one `ExtractorError` will be raised.

I couldn't test album downloading with redirect yo YT because most albums are blocked in my country. I managed to get playlist info with http_proxy set, but then it stops on "Confirming age" (definately proxy problem).
test link: https://myspace.com/starset2/music/album/transmissions-19455773