Fix Blender DAE exporter - files are unreadable by Assimp
Created by: TheJosh
Files produced by the blender dae exporter plugin are unreadable by the popular Assimp library.
Colours came though as 3x component instead of 4x component. If colours are in 3-component format, a fourth (alpha) component is silently added with a value of 1.0.
Index of refraction was in the wrong place, it's now inside the element.