Embed Service Add: Youku

[kerbalwzy]

Add support for embedding videos from the YouKu platform

{{#ev:youku|XMzc0Mzg4NTE5Mg}}

[octfx]

@kerbalwzy I can merge this as soon as the Lint Test succeeds :)

[MrT-tak]

Hey, I'm still a newbie so I dont know how to contribute to this. you just need to add newline to youku.php line 17 and etc