Paint on reflection material

![paint](https://f.cloud.github.com/assets/690661/933968/f3b4b520-0060-11e3-8abe-4d838a0e3bca.png)

Painting tool is nice! but i wanted to see the color on other materials.. so i multiplied the vertex color on reflection color. and removed the behavior of changing shader when select 'paint' tool.