My contiguity force challenge executable is:
https://s3.amazonaws.com/sabrawer-contiguity-force/contiguityForce-1.html
It is potentially useful because I used the flag images directly in D3 and SVG. Examples of this seem hard to find. The challenge example does not do that - it puts the image in HTML elements.
The source is here:
see ReadMe.
The images for the flags were downloaded as individual files from http://www.famfamfam.com/lab/icons/flags/