Modified the code to work with Octave 3.6.4 in Windows

Some of the features in the code weren't implemented in Octave version 3.6.4, so I modified the code so that the Script.m runs through in Octave in Win7.

On a related note, thank you for publishing the code! I'm going to start using an IMU for assessing physical performance as affordable (not to mention more portable and convenient)  alternative to a force plate (which is what I've used in the past). Dr. Madgwick's method ought to work as is, and saved me a lot of unnecessary re-inventing the wheel (assuming that I would've ever gotten there, which is not a given). I will cite Dr. Madgwick's thesis and/or the paper indicated in x-io Technologies web page when I publish my work (in a couple of years :) ). Please let me know if you'd prefer some other references to be cited.