http://stackoverflow.com/questions/6556559/youtube-api-extract-video-id
http://stackoverflow.com/questions/10591547/how-to-get-youtube-video-id-from-url
https://ctrlq.org/code/19797-regex-youtube-id
http://stackoverflow.com/questions/5830387/how-to-find-all-youtube-video-ids-in-a-string-using-a-regex/5831191#5831191
https://gist.github.com/takien/4077195
