Feature/maya vray standard

I started implementing changes we've discussed for the maya vray standard template. Those changes include:

1. Background Image Sharpness
2. Linear Workflow fixes
3. Shadow Catcher solution changed from VOP approach to materialWrapper approach. 

I setup the materialWrapper's base material to check for my initial implementation (groundBounce + groundBounceMult), then if it doesn't exist check for our new implementation (single float RGB parameter "GROUNDcolor") and finally if this does not exist use a single float RGB of 0.25, 0.25, 0.25. That way it should be compatible with all possible ibl format states (current state, upcoming state, hdr sets state).

I also tried to keep commits on a rather atomic size.

Next thing will be adjusting the rect light setup. I don't consider this feature state to be ready for release but I'd like to start a discussion while working on it :)