* http://www.york.cuny.edu/~malk/tidbits/tidbit-bin-packing.html
* http://www.diku.dk/hjemmesider/ansatte/pisinger/publications/sort_date.html
* http://stackoverflow.com/questions/140406/how-can-i-programmatically-determine-how-to-fit-smaller-boxes-into-a-larger-packa