#41: add '-y' flag to overwrite existing file
#41: save converted file in 'recording-converted' directory
#41: correct path where converted .wav file is saved
Merge branch 'master' into ffmpeg_fix
#41: fix typos, and correct initial path location
Merge pull request #45 from jeff1evesque/ffmpeg_fix

#41: Install ffmpeg and test '$ ffmpeg -i audio.wav ...'