Scrapes abgt url for tracklist, returns list
Added url getter + small changes

getTracks(url):
checks if url exists, if not returns empty list of something goes wrong
(ie 404)

urlNum(num):
takes int or string as input for the episode number, then calls
getTracks with the url, returns that list
Merge pull request #1 from ngqminh/master

Scrapes abgt url for tracklist, returns list