Initial implementation of DIN99d

DIN99d is a modified version of the DIN99 UCS. Based on experimental data, several coefficients were changed from the original standard, and a hue rotation is added in the XYZ tristimulus space to improve uniformity primarily in the blue regions of the space.

There are many different DIN99 standards; however, in my research, DIN99d seems to be one of the most supported and used. So, I thought that including it may be beneficial for some later on down the road.

My primary reason for including this space is that it is used to derive the Modified Uniform Oil Color Scale (mUOCS), which is being used for research at my institution. (http://www.sciencedirect.com/science/article/pii/S0260877412000957?np=y) If this is adding too much "clutter" to the library, I am happy to keep it as a personal addition.