Update CHANGES.md.
Update CHANGES.md.

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