Added course description parser

Added the parser for extracting data from http://coursecatalog.web.cmu.edu pages to JSON files.
http://coursecatalog.web.cmu.edu/coursedescriptions/

Went to this web page, downloaded the html, and used some vim hackery to get the links. We could parse this page in the future if we're worried about the links changing, though I'm not sure how often the list of departments changes.