SAS - Standard Anisotropic Shader

During December I worked on an update of my Cloth Shader for Unity 4 After some days of work several ideas came to my head. "What if it is suitable for metals?", "What if I make a metals demo?" "What if I try to shade a cymbal? "What if supports transparency?", "What if... carbon fiber!!", "What if, what if...." So it started to grow until I realized it was too big/flexible to deliver it as a simple update. Instead of that, I have released it as an upgrade for previous buyers of the old cloth shader.
The new version aims to model any kind of scratched surfaces.