Merge pull request #25 from playcanvas/master

merge
Merge pull request #26 from playcanvas/master

merge
- Fixed light intensity issues;
- Added scene-wide prefilteredCubeMap properties;
- Shader now uses scene's prefilteredCubeMap if it's not overridden in material;
- Removed forgotten console.log;
- Added temporary workaround code for loading prefilteredCubeMaps from static address.
Scene-wide skybox
Removed workaround cubemap loading
Merge pull request #99 from guycalledfrank/pmrem

More on prefiltered cubemaps + scene skybox + fixes