Merge pull request #2 from playcanvas/master

update myself
fixed skinning & specular bugs, added defaultGamma and defaultSpecular, added energy-conserving Blinn-Phong
Merge branch 'shader-system' of https://github.com/guycalledfrank/engine into shader-system
Merge pull request #50 from guycalledfrank/shader-system

Shader system update + fixes