Elevation Shadows

[blushru]

I think the colors are tied to the wrong values for elevations 1, 2, and 3. The 20% opacity color should have a negative spread value.
The 12% opacity shadow should have the highest blur while the 14% opacity should have the highest "Y" value.
It would also be nice to have the 3 shadow layers all populate in the same order across different elevations, based on color.