Add support for Youku.com playlists

[PannenkoekenNL]

• I've verified and I assure that I'm running youtube-dl 2016.09.11.1
• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Feature request (request for a new functionality)

Description of your issue, suggested solution and other information

Could you please add support for playlists on Youku.com? Example of a playlist with 161 videos: http://list.youku.com/albumlist/show?id=4405574 Another with 16 videos: http://list.youku.com/albumlist/show?id=4401438

[yan12125]

Those videos (Crayon Shin-chan) are copyrighted products of Shin-Ei Animation according to Wikipedia: https://en.wikipedia.org/wiki/Crayon_Shin-chan. Do you have other examples?

[PannenkoekenNL]

Sure, as it happens with every playlist.
Two random playlists:
http://list.youku.com/albumlist/show?id=26882448&ascending=0.html
http://list.youku.com/albumlist/show?id=27503783

[yan12125]

Thanks!

[GameXG]

I need to download http://list.youku.com/show/id_z1b060af25b4a11e5b2ad.html, but now youtube-dl does not support and i will try to implement this feature.

If time is enough, I will try to implement http://list.youku.com/albumlist/show?id=27503783.

[jerry011235]

Youku.com playlists Include two categories：
1.official playlist like：http://list.youku.com/show/id_z2ae8ee1c837b11e18195.html
2.UGC playlist,like : http://list.youku.com/albumlist/show/id_2336634.html
hope add UGC playlist. this will be help.