Add 8 textures and BRDFGlassGlossy

Add Textures (Bulge, Granite, Grid, Leather, Smoke, Snow, Speckle,
Stucco)
Add shader BRDFGlassGlossy
Fix bug in BRDFGlass,, TexCellular
Correction setting

Correction setting for Stucco & Leather
Merge pull request #106 from Seliverstoff/master

Add new textures by Seliverstoff