Added clear blue skybox and updated metalRough textures to conform to spec
Added clear blue skybox and updated metalRough textures to conform to spec

oterral/cesium,likangning93/cesium,ggetz/cesium,jason-crow/cesium,NaderCHASER/cesium,YonatanKra/cesium,NaderCHASER/cesium,emackey/cesium,wallw-bits/cesium,CesiumGS/cesium,CesiumGS/cesium,YonatanKra/cesium,AnimatedRNG/cesium,josh-bernstein/cesium,oterral/cesium,ggetz/cesium,soceur/cesium,josh-bernstein/cesium,ggetz/cesium,hodbauer/cesium,kiselev-dv/cesium,jason-crow/cesium,wallw-bits/cesium,ggetz/cesium,progsung/cesium,AnimatedRNG/cesium,soceur/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,NaderCHASER/cesium,geoscan/cesium,jasonbeverage/cesium,likangning93/cesium,kiselev-dv/cesium,emackey/cesium,soceur/cesium,CesiumGS/cesium,jason-crow/cesium,wallw-bits/cesium,hodbauer/cesium,jason-crow/cesium,likangning93/cesium,jasonbeverage/cesium,kiselev-dv/cesium,hodbauer/cesium,YonatanKra/cesium,CesiumGS/cesium,likangning93/cesium,aelatgt/cesium,oterral/cesium,AnimatedRNG/cesium,emackey/cesium,geoscan/cesium,progsung/cesium,kaktus40/cesium,kiselev-dv/cesium,aelatgt/cesium,YonatanKra/cesium,emackey/cesium,aelatgt/cesium,kaktus40/cesium,wallw-bits/cesium,AnalyticalGraphicsInc/cesium,aelatgt/cesium,CesiumGS/cesium,AnimatedRNG/cesium