Matrix.Lerp goes backwards??

[JCPalmer]

Unless I am interpreting what the gradient arg to Matrix.Lerp wrong, it seems to go backwards.  I changed it to this:

public static Lerp(startValue: Matrix, endValue: Matrix, gradient: number): Matrix {
    var result = Matrix.Zero();

    for (var index = 0; index < 16; index++) {
        result.m[index] = startValue.m[index] + ((endValue.m[index] -  startValue.m[index]) * gradient);
    }

    return result;
}

The higher the gradient, the closer to endValue, right?  The process before was:

result.m[index] = startValue.m[index] * gradient + endValue.m[index] * (1.0 - gradient);

The title of the last PR was fixing Lerp.  I really thought this was a great improvement.  I could never get the bone interpolater I am working on with the now DecomposeLerp.  The new one is also much faster. 

But, if 10 was a start value, 20 the end, & .2 the gradient, then the answer should be:

10 + ((20 - 10) * .2) or 12, not

(10 *.2) + (20 * (1 - .2)) or 18

[GameMonetize]

Ouch...correct. I'll fix it