Mundane details, what's not to like? Fixed issue with inner-func, query_url
where I was querying the track_url outter scope, instead of func, which is
the parameter that I should be querying. Fixed and working.
Renamed track_urls -> tracks. Added docstring to gen_example.tracks. Moved
generator into a more final form.
Merge pull request #5 from r3/master

More working, less repeats