added some comments to thumbnailer/shadowbox.py and changed some variable names for clarity.
added some comments to thumbnailer/shadowbox.py and changed some variable names for clarity.

Rhombik/rhombik-object-repository,Rhombik/rhombik-object-repository,Rhombik/rhombik-object-repository,Rhombik/rhombik-object-repository,Rhombik/rhombik-object-repository