v1.40, June 12, 2014 -- Initial public release.
v1.42, June 19, 2014 -- Removed dependency on simplejson
v1.43, June 27, 2014 -- Fixed JSON handling issue
v1.44, July 3, 2014 -- Added show_tracks.py exampole
v1.45, July 7, 2014 -- Don't used cache auth codes when scope changes