Fixes an issue where successive calls to Color.fromRandom() returned the same color.
Fixes an issue where successive calls to Color.fromRandom() returned the same color.

YonatanKra/cesium,progsung/cesium,soceur/cesium,hodbauer/cesium,YonatanKra/cesium,likangning93/cesium,likangning93/cesium,josh-bernstein/cesium,likangning93/cesium,progsung/cesium,CesiumGS/cesium,likangning93/cesium,likangning93/cesium,kaktus40/cesium,hodbauer/cesium,hodbauer/cesium,soceur/cesium,YonatanKra/cesium,soceur/cesium,CesiumGS/cesium,YonatanKra/cesium,jasonbeverage/cesium,jasonbeverage/cesium,josh-bernstein/cesium,AnalyticalGraphicsInc/cesium,geoscan/cesium,kaktus40/cesium,CesiumGS/cesium,CesiumGS/cesium,CesiumGS/cesium,AnalyticalGraphicsInc/cesium,geoscan/cesium