Supports "Last, First" author naming as well as multiple authors separated by "," or "&".
Valid author folder names:
Ichiro Kishimi
Kishimi, Ichiro
Ichiro Kishimi, Fumitake Koga
Kishimi, Ichiro, Koga, Fumitake
Ichiro Kishimi & Fumitake Koga
Kishimi, Ichiro & Koga, Fumitake