Grabs the html5 video links from a Stanford MyVideoSU course page. They can be
subsequently downloaded conveniently via a tool like JDownloader.

HowTo:
node linkgrabber.js <input_file> <classname>

Sample usage:
node linkgrabber.js test_input_cs246 cs246 > cs246_links
(test_input_cs246 is the test page I used. However, for fear of copyright
issues, it is not included in this public repo)