[Bf-cycles] A Single "Cycles" Shader

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This is a interesting idea and i think this is possible.
For this, we should not change any cycles code and add more shader (this 
make kernel more complex).
Instead, we could use python code to add new material panel for setup a 
"virtual shader".
This virtual shader is combined from existing shaders (setting should 
look like blender internal).
Another idea: some predefined shaders with clear UI that look less 
technical (should look like luxrender).