jux.lua: download url referenced in url. example:

https://d3ue6twrehycpw.cloudfront.net/q/thumb/x598%3E/quality/85/interlace/true/src/http%3A%2F%2Fi1.ytimg.com%2Fvi%2FxQ-LYElvtEU%2Fmaxresdefault.jpg
download from url ^:
http://i1.ytimg.com/vi/xQ-LYElvtEU/maxresdefault.jpg