fixing vector3dtilescontent spec
fixing vector3dtilescontent spec

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