Fix PostProcessStageLibrary specs
Fix PostProcessStageLibrary specs

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