Cohen's Kappa (with customizable weightings)

This script is entirely and completely based on the previously published Cohen's Kappa script by Giuseppe Cardillo, available here:
http://www.mathworks.com/matlabcentral/fileexchange/15365
His script allowed you to calculate unweighted, linearly weighted, and quadratically weighted Cohen's Kappa. All that I have done is allow you to enter in a custom weighting matrix for use if your weights are not linear or quadratic.

For more information on Cohen's Kappa see:
http://en.wikipedia.org/wiki/Cohen%27s_kappa