New issue 81 by shao...@gmail.com: Temp file leak in LocalAudioFile if
ffmpeg throws an exception
http://code.google.com/p/echo-nest-remix/issues/detail?id=81
audiofile = audio.LocalAudioFile('some_bad_or_missingfile.mp3')
audiofile.unload() # call unload() to delete any temp files..but since
object was never created due to exception this is unbound...and a wav file
is left in /tmp